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Personally I'd rather look for as many needed bottles of AC DELCO ATF Type III (H) which one can still purchase today, it IS GM's designated fluid for all older transmissions that used Dexron II or Dexron III (H).

Also, just a bit of a warning. If a trans fluid/filter change is in the books, it might be a good idea to insist that they use dexron /mercon fluid, instead of DexVI or something like Valvoline MaxLife. You can't get licensed Dexron III these days, so the Dex/Merc fluids that state they are for older GM and Ford vehicles are going to be the closest you can get. I have a 1992 Regal that is fairly low milage (currently under 72k KMs) that still had its original trans fluid in it. It was due for a change, but otherwise everything was functioning as it should. I did a pan drop, changed the filter, and re-filled with Valvoline MaxLife. Got the levels set, and everything seemed great. In short order though, I was dealing with a downshift issue into 1st. Essentially, when the vehicle went into lockup before the trans was fully warmed up, slowing down to the point where 1st would engage resulted in the trans acing as if it were in neutral. Even the increased line pressure in manual 1st. wasn't enough to engage it. You could shift to Neutral and back into Drive though, and it would act exactly as expected, so I simply worked around it and shifted into Neutral while slowing down, then back into Drive just before coming to a stop. The more I dug into the issue, the more I realized that the MaxLife was likely the cause, as older transmissions don't necessarily play nice with the much lower viscosity of MaxLife. I just recently pumped out 4.5 quarts of trans fluid and replaced it with Dex/Merc, and on the first test drive the issue was nearly eliminated. My plan now is to drive it a little bit more, then pump it out and refill again to get as much out as possible. I will be sticking with Dex/Merc from now on for this one.

Update, I ended up finding a drivers window with the part attached. The only way to get my hands on it was to offer some serious coin to a gent that was trying to sell his 95 without any luck. He ended up pulling the drivers rear window for me also; if anyone is in need. If I plan to keep my Olds, I'll probably just take his whole car for parts as he only wanted 1k for it. At the time, I didn't bother as it was over 800km's away and I didn't want to invest in the tow. FYI, it's a heck of a little job to get the glass out without damaging anything. There are a few parts that (when disassembling) are very likely to be damaged if you don't know the exact process. Even following what little info is in the Service Manuals, the interior door panel is vulnerable to breaking the little molded housings that secure the plastic plugs in place...