Here are some perches on a Dana 80 that I modified to fit narrower springs on the slightly wider perches. In this case the spacing was already correct.
https://picasaweb.google.com/lh/photo/ydeakI-wVgnJH8jITsPJ99MTjNZETYmyPJy0liipFm0?feat=directlink


Better yet is if you have the original rear axle to the truck it very likely has 4" tubes same as the Dana 80. Remove those perches to use on the Dana 80. I have a pair saved from my 2 ton axle for the next time I get in this situation.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-