Ok, it's in Turbo Bike vol 4 number 2, the guys name is Yves Giard from Quebec. He had a Kosman framed Mr. Turbo draw through system with 3 stage nitrous (1307cc 1052 motor), went 7.76 at 173 in 1995. He made gears for the stock trans that were wider (physically as well as ratio) hence the 4 speed. Address listed in article is:
Giard Racing Team
2855 rue Dumensil
SAINT-HYACINTHE, Quebec
J2S 6J7 Canada
Tel 514-773-2698
Now there also a little mention of said gears in the back of the same magazine that lists the street address as 28555 instead of 2855. This section says Yves removed 5th gear making room for larger/stronger 9310 alloy gears, 3 gears make up the set (so it must use one stock gear)
Good luck, I'll see if I can find anything on the aftermarket trans as well.