I would suspect 7-tooth. The 93 T5 I bought new from D&D had a 7-tooth in it. I haven't seen a production T5 with the 8-tooth in it.
Only way to know for sure is to count the teeth. Use a mirror on a stick and you should be able to see/count the teeth.
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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team