Flat Blades for Gravely ZT-HD52

Please disregard this, I have moved it to "Mower & Equipment Operation".

The OEM blades on my 2019 Gravely ZT-HD52 have a 5/16" offset. I'd like to replace them with notched high lift blades (like Oregon 91-312) that happen to be flat. To adjust for the original offset and deck volume, I was going to use a 5/16" spacer on each blade but Oregon and my dealer said it isn't that simple and probably won't work. I've looked all over for a notched high lift that has an offset, and can't find one.

Are they making too big of an issue out of the spacer idea? Has anyone else been successful switching from offset blades to flat?

Just for reference, the OEM blade is #03253800 (Oregon 92-151)

Thanks

Also, if you know of a notched high lift with an offset that I'm not aware of, I'm all ears. I like the idea of flat blades better, but if it's not going to work, I'll purchase ones with an offset.

Thanks