OEM is OEM...where you get it .....usually from someone authorized to carry and or sell OEM....some stuff is no longer available anywhere....AMAZON sells stuff, lot's of stuff some good some very bad from only God knows who....they do not manufacture anything....cheap parts are cheap parts no matter..best bet for anything is OEM unless it is NOT available and or you DO NOT want to pay for it...Is to roll the dice...and buy from whomever where-ever..... Better yet go to and support your local guy if you can....It's kind of like jack-assing to Home Depot and they do not have it....when you could have gone to the local hardware store ...gotten it....and for less time and effort...or a lot of places WILL get it for you!
Good Luck and be well Sir
Original Equipment Manufacturer is OEM
Like most garden equipment makers now days Still do not make any part of their blowers
Each & every part is made by an outside company ( although Stihl may also own some of them ) sent to Stihl then assembled
Even the assembly on some models is outsourced .
So any company in that chain is by LEGAL definition an OEM
So it is legal to sell them advertised as OEM regardless of weather they were part of a Stihl order, the parts that Stihl's QC inspectors at the factory rejected or the same part ordered by Cheap & Nasty Mower Parts Pty Ltd.
When a model is brand new Stihl ( & most others ) order that moulds & dies are either destroyed or returned to Stihl .
If it is a follow on model of a run of models then they do not do this in order to get a cheaper per unit item cost .
Thus when the dies , moulds are a bit worn and what they pop out gets above X% rejects , the manufacturer will grind the Stihl numbers off them and start making aftermarket parts
These are OEM parts, made on the same machines at the same factory using the same moulds as the genuine Stihl items .
The factory that makes them usually gets paid more by the after market suppliers per item than Stihl pays them so they accept the higher reject rate .
The rejects get on sold as scrap or defective parts for repair
Some are repaired and get on sold back into the parts stream and what can not get sold as scrap
However a lot of this scrap can not be visually identified as scrap so remainder merchants buy it then sell it into the off brand parts stream as OEM which is quite true.
They just don't tell you that it is an OEM REJECTED part
If I sold them then my cranky customers can come back through my gate, demand a refund or replacement or give me a punch on the nose cause they are really cranky.
Bezos set up Amazon to ILLEGALLY trade in counterfit books or to circumvent book distribution deals between publishers & retailers .
So to prevent his vendors being sued by authors, publishers , distributors or retailers he hid the identity of the vendors
To prevent himself being sued he set Amazon up as a logistics enterprise distributing books o behalf of the unknown vendors .
Google , Face book etc use the same arguement to distribute illegal & immoral material on the web .
So Amazon was an illegal enterprise from day one set up to defraud copyright , distribution & royality owners .
Now because the richious , moral , law abiding citizens of the USA ( originally ) are quite happy to be part of a scheme designed to defraud the legal owners of their riteful incomes if they books ( originally ) they buy are a little bit cheaper , Amazon thrived and the small publishers of low volume books went bust and sacked thousands of American citizens they employed.
As Amazon went from strength to strength Bezos expanded the product range because the Western World is by and large very greedy selfish stupid & very very lazy .
So now if you want some thing you just grab it from Amazon.
Now criminals saw this for what it was set up as , the perfect cover for criminal activities selling counterfeit & stolen goods and that is what it has become .
Now some of the vendors are honest , law abiding people selling quality goods but the bulk are criminals and thieves either selling counterfeit / defective or stolen goods or selling good stuff then vanishing just before tax is due so stealing from the government and all of the genuine shop fronts that can not change name over night and pocket all the tax they collected and avoid income tax all together .