spring perches

[sick69]

Does any one have an extra rear end, for a 70 half ton coil spring truck, that can get the measurement from the center of the spring perch to the center of the spring perch for me?

I'm at my cousins this week and just fell into a 9" posi with discs for $100.00 . If I can get the perch measurement then we can get the perches mounted and go home next Thursday with a new rear end ready to bolt in.

Thanks guys,
Frank