u-bolts?
 

Can anybody share a source for longer rear u-bolts to lower a 68 burb?

Re: u-bolts?
 

Best plan I think is to find a shop that does spring work for big rigs.

They will make them to your specs pretty much while you wait, at least that's the experience I had when I had my suspension worked on at shop that specialized in servicing heavy duty trucks.

I've also read quite a few posts in the past, that people in your situation have searched out a shop like that and have had positive experiences.