[fleetsidelarry]

At the rear, anything past '72 is leaf spring and not a direct bolt in. The '71-'72 rears are 5 lug and 3/4" wider each side (1.5" total) than your '68. A '71 or '72 donor would give you front and rear 5 lug with discs up front. Up front as you've discovered there is more choice in model years that bolt in.