take this info to every local parts store or auto shop/trans shop until one of them says they have one. That's your best bet...
For the fluid, put in 6 quarts of the newest fluid. Start the car, on a level surface, and let it run, checking every 2-3 minutes and adding until it hits halfway in the hash marks on the dipstick. Test drive around the block, babying it, then park and check it again. Add if it needs it, and see how it does once you are 100% sure that the fluid level is correct.
You can swap a quart or two of the old fluid in, if you really want to.