Richer Racing 64" Spring Front Hangers

[VintageIronFab]

Hello All,
I have a set of Richer Racing front spring hangers that work with the 64" spring. I am guessing that the front or rear holes line up properly but the other 2 front/rear holes need drilling. I have some rear Kelfab spring hangers that fit a FSB but my F150 frame is pretty different and the hangers appear to need reworking on the bottom. Anyway if you have installed the RR kit I'd love to know how it's designed so I know how to possibly proceed.

Thx a ton,
Matt