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The new speakers KICK BUTT. Infinity Primus. No looking back. As it turns out, 5 years ago I installed the Retrosound R-69Ns. One is still good but the other one blew out. I figured out which two wires were needed, don't use the blue and blue/white stripe wire set, they are not needed.  Next up: replace the factory door speakers with the NOS ones I have in storage. All I have to do is find them...........

I went thru some of this non-compatible B.S some 11 years ago when I updated my A/C system to 134.  I had already purchased a newer 134a compressor to replace the original R12 compressor that was leaking, at THAT time I didn't realize that the manifold hose assembly ends (fittings) had been redesigned for the 134a systems. Seeing as I HAD to purchase the 134a manifold assembly for the redesigned compressor... I did NOT want to replace all of the other hardware, the new manifold would NOT fasten to the older receiver/dryer because the threads were altered........ all of this fell into play as I had also updated the brake vacuum booster, the larger booster required a *newer* 134a liquid side A/C delivery pipe. The newer pipe was redesigned to go under & around the larger dia booster & would NOT fasten to the older design receiver/dryer, the fitting threads were not the same. I had to cut off the ends of the newer pipes & cut off the ends of the original & swap the old fittings to the new pipes & tig them into place. Hopefully you can avoid all of the B.S if you keep everything compatible. The 96 V5 compressor is near identical to the older V5 with respect to its *clocking*,  what IS different (besides the rear housing casting) is the mounting points openings...where the older item has threads cut into the flanges the newer design sees thru openings with no threads cut.         

When it comes to evaporators, the real test would be checking the part number for a 92 Regal with the 3800 against one for a 92 cutlass. If the part numbers match, you should be OK there.    88-95 Regals with the 2.8/3.1/3100 would have had the same AC setup as the other Ws of the same year. The 3800 series 1 cars, of which the 90-95 Regals were the only Ws to use it, used a completely different AC compressor and AC setup(Cycling clutch vs variable displacement compressor) Some parts might match and interchange with other Ws, while others won’t.    Just something to keep in mind when cross shopping parts. AC parts for a 92 Regal with the 3.1 should all match a 92 cutlass, where as parts for a 92 Regal with the 3800 may not all be the same. 

Reviewing some components other than lines... I just checked the part numbers (3093285) for the evaporator core, and they're the same part from '88-'01 in just about every W-body, including 92 Regal, 92 Cutlass, 98 Monte. So at least the fittings there should bolt up no problem from any donor. The condensors are the same part number (52452050) from 89-93 and 94 Lumina (did it still get R12 that year?), and a second part number (52481282) for the rest of 94-01. Aftermarket lists them both as having 3/4" - 16 thread inlet and outlets, good for R12 and R134, but different core thickness (18mm and 25mm), and slightly different core dimensions and styles. Other than that they seem to be the same, possibly interchangable. I already do have a brand new 89-93 condensor I bought several years ago and never installed.

One issue you may run into there is that 3800 series 1 powered cars all used the HR6 style AC compressor vs the V5 compressor that the 60 degree V6s and the 3800 series 2 cars used.  A 1996 Buick Regal 3800 would have had a 3800 series 2 from the factory, so you might need to look for the AC components for one of those.