Stock Rear Springs, where to buy?

[A1980GMC]

I just got my 73 Blazer and I am already planning out my lift. I already have 6" Superlift springs for the front. I plan to put some OffRoad Design greaseable bushings in them. I plan to use OFD's 4" shackle flip in the read. I had one on my 99 Suburban and liked it. So I will top it off with a 2-3" block in the rear.

So here is my question. The rear springs are 40 years old. I don't want lifted springs as I feel stock ones will give a better ride. Where is a good place to get good OEM springs? I have not measure the spring eyes yet, so I am not sure if the 73 rear springs are the same up to 1991 or later or what.

Thanks for any help given.
Posted via Mobile Device