It's a lot more expensive than bearingsTaking a wheel bearing out of a motor bike wheel and replacing it with a Bush
I need a 37mm OD 30mm ID 12mm thick
So what's cheapest way I need 4 possibly 6
Thats all I have found up until now have you a link for the couple of quid ones?30 ID 37 OD isn't a standard size in my book, so you will be doing some lathe work - so make one out of anything to hand.
What's wrong with the ball race? Replace it with a cheap one - seen on-line from only a couple of quid at those diameters, but narrower - space it out with anything. If life doesn't matter, just location, it should work.