Getrag ID plate?

[Kooterskkar]

I just swapped a 5 speed tranny into my Corsica. Supposedly it came from a beretta. I need to find a speed sensor for it. The tranny uses a gear driven sensor, but ive only been able to find a magnetic pickup sensor. Ive checked for every GM fwd v6 I can think of and they all list a magnetic pickup sensor. I did some more digging and found I can use a sensor from a Fiero OR from a Quad 4 engine. So that parts all good, but now I want to know what car this tranny originally came out of. Isnt there an ID tag on the tranny that I can look for? Which numbers do I need or where can I look this kinda stuff up? Thanks in advance for any help.