Best Penetrant to Remove Differential U-Bolts?

Again, AMK has the correct flattened crosshatch bolts in 2 different lengths and the correct tall lock nuts. AMK has a big paper catalog for like $20.00 or $25.00. Get online, order the bolts and nuts and one of their catalogs, It has all of the neat OE bolts and nuts and other assorted for GM, Ford, and Mopar.. It is well worth the money!