Solid front tires, marathon tires

I'm to the point I am tired of my front tires getting bumped off the rim/ going flat or whatever the case might be. I need some help with what to purchase. Should I purchase the 5/8" center hole or the 1/2" center hole. Below is a link to what I am looking at.


Current rims are 5/8" center hole, with a 5/8" collar, with a 1/2" Bolt.

I'm wondering do I just leave out the collar and buy the 1/2" hole, use the provided spacers so it can fit in the caster and run the 1/2" bolt through.
 
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