Air conditioning R134A swap

[sheppardpat47]

Hey guys, is this the kit for the JDM OEM A/C compressor ? I'm going to switch to R134A (the good way) but I don't know which kit to buy..

Context : I have a kouki 10/1985 Sprinter Trueno with all factory manual air conditioning system, it worked "okay" when I got the car from Japan but on very big heat waves it wasn't as cool as I hoped.

So I had the great idea to, well, swap from R12 to R134A without swapping anything. A guy hooked up a machine who tested the system, removed the old oil and freon, filled up with new oil and R134A and, it worked, REALLY, REAAALLY well. Like the coldest A/C I've ever felt in my life. Unfortunately, it only lasted from June 2025 to late October 2025, but it worked everyday with no problem.

A/C button is blinking, someone told me it was related to low pressure in the system, so, there's a leak (like who could have guessed lol) because R12 is thicker than R134A, so it won't leak through the rings but R134A does.

The results : I have now a complete stock R12 system, filled with R134A and R134A oil, but non working. Was working, compressor not seized.

I know I need to change the o-rings on the lines, and in the compressor
Not sure about the A/C expansion valve if I really need to change it or not? If I can keep myself from removing the entire dash it'll be nice

Someone in the MR2 AW11 Facebook group told me to use a RAV4 compressor instead, easier and OEM and bolts right in, but I'm not sure which one to use lol

If anyone have ideas...