I know I bought these in the past... I still get email sales flyers from the company.Easiest way to move the axle back 1" or 1 1/2" is to use Zero Rates. I've been running them for years without issue. They do add 1" lift to the axle. (Pretty sure this is the offset spacer DirtDonk mentioned.)
But I didn't use them for reasons I can't remember. And I don't know what became of them?
Thanks Scoop, for the option, actually the reminder...