1972 c10 trailing arm axle measurements?

[chrismeyer78]

I have searched and found conflicting measurements. I am trying to swap in a different axle into my 72 c10. I need measurements for the on center for the trailing arm pad mount. I've seen people who have posted old frame measurements from like an old shop manual or something....but not for the axle. I want stock measurements and a pinion angle to weld the perchs on. Surely somebody could give me an angle differnece from the yoke to the pads...or something of the such. I want to paint the axle and put it under the truck once. I understand I could tack it together and mount...then remove and weld it up...and then reinstall it. I don't have an old axle to get the measurements off of. I attached a picture of my situation.

Thanks guys....I really appreciate any help you can give me.