I have Ford shop manuals for both Gen 1 and Gen 2s, and the diagram on both shows the ATX version with the accumulator at the firewall. Essentially yes, as stated, the a/c systems for the MTX cars are exactly the same except for fittings for R-12 on earlier years and fitting for R-134A on later years. The same accumulator will work, but if it has an R-12 fitting, I think you can just put a 134A adapter on it and go with it.
I just installed a liquid line w/orifice tube (it's integrated in the line) and an accumulator on my 95. I'm going to do an a/c overhaul on my 89 since the compressor died.
Shop around for parts, you can probably find a better deal on the liquid line and accumulator on Ebay. I have found the accumulator for 40-60 bucks vs. the $100+ that they usually go for. Liquid line runs about $25. Condenser $50-75 (and I just missed a deal on Ebay for one at $26 shipped--damn), Compressor $200+. Re-use everything else if you can. 2 of the lines are obsolete (one of those going from the bottom of the accumulator to the compressor). The manifold lines are still available, but they are $$$$.
If your obsolete lines are fuxored, find an industrial supply house that specializes in hydraulic and a/c lines. I had one of my obsolete lines re-formed with new fittings, so it can be done.
