When I did mine the fill bolt was seized. I tried everything to get it off, but eventually I went to store got a big 24mm nut and quickly tacked that on top. Came off easily with that dab of heat and nut easily crank on. Also, Aisin Warner is a Toyota company. This transmission and variants of it were used all over (Ford, Buick, Toyota, etc.). I used a Titan ATF 4400 fluid which meant the spec of the original Saab fluid (AW-1). It's also made by Fuchs which has made other Saab transmission fluids as well. I never had issues after 60k and multiple changes on the stuff. It was about $12-16 a quart.