drop components for '91 c10

[love it loud]

Hi all, I was thinking of going with a 4/6 drop on a '91 c-10, and was wondering if anyone knew why a different part number is listed for 88-91 spindles and 92-98 spindles? If the brakes on the 92+ are better, would it be a good idea to upgrade to the 92 style or just replace the factory brakes and get the spindles for the 91? Also, any suggestions on a brand? DJM, Belltech, Western Chassis? Have western chassis on my 80 and happy with it, but if anyone knows where I could find a good deal on pretty much anything besides chassis tech i'd be all ears! Also, anyone with an 88-98 c-10 with a static drop, what drop are you running, and would you recommend the 5/7 over the 4/6, or are most of you with the 4/6 happy with it? Thanks a lot for any input into this thread.

P.S. Recommended wheel/tire combos with a 4/6 or 5/7 drop would be greatly appreciated as well!!!