Wow, whole new diff brackets. Interesting. I'm not sure it'll be cost effective but I'm sure there'll be interest in that.
I'll have to see if I can dig up the source CSTYLES & I found for the bushings. IIRC, they were about $8 & you'll need 4 for each set.
I'm not a big fan of indexing the brackets since it'll put your U-Joints at different angles (phase) on the driveshaft. I'll be interested in seeing how it works out for you.