That's strange. Never heard of a 1.5" lift from the usual body lift manufacturers. No matter, I guess. Just a new one on me.
Could have gone to a salvage or scrap yard and pull those bottom washers off of just about any GM vehicle from around 1980 on up. Cars and trucks share almost identical steel parts and rubber mounts between them.My lower washers for my 85 k5 were shot. Wasnt gonna pay $70+ from LMC for 6 washers.