The Factory 6" bolt is too short due to the thicker end caps and most suppliers only carry whole sizes above 5" the prefect length is 6 1/2" and I was cutting them myself but that became to time consuming. You can saw it off just be sure to taper the end on a grinder and smooth the first threads.
I can get the bottom roller but I have to buy a dozen at a time . if I had a few people interested I would consider ordering a case, I will get a price.