14 bolt spring perch width

[kelly1]

Hey guys, I'm looking at buying a 14 volt SF 6 lug rear end to go under my 1997 tahoe 4wd. The wms-wms is 68". What should the spring pad width be in order to fit under my tahoe? I want to make sure I'm getting the correct one.

I don't have the tahoe around me for a few days to measure it. Thanks!