Well, like I said, your chassis is virtually identical to the Chevy, Pontiac, Olds and Buick line of "B" bodies. Any performance equipment you find for a Chevy will work on your Caddy.

Another interesting fact is the matter of brake rotors and bearings. Your Caddy has a 5 on 5 wheel bolt pattern. It's a simple job to swap over to the smaller "G" or "F" body brake rotors to get the more popular 5 on 4 3/4 bolt pattern.

What I would suggest for you to do is go to an online parts store. Look up all of your suspension pieces and then cross-reference those numbers with the other GM lines. That's what I did while researching my Astro Van Project. The early Astro's use ALL of the same bushings, bearings, spindles and brakes as your Caddy. Astro's also have a 2" dropped spindle available that would work with your suspension and a set of the bigger ball joint lower control arms from a cop car or '95-'96 Impala. Any Impala suspension pieces will work also. Same chassis...
Mark