Ok, cool. Sounds like it could well be a 98...crazy, can't say I've ever heard of a Series 3.5. Makes sense tho with the weird stuff it has on it, like big sump oil cooler, leather and nismo dials.
What is an AUTECH ?
I checked as my clutch and box is out and the clutch is a pull type. I'm going to the gearbox specialist tomorrow to check if some parts i orderd for a 12/97 and newer fit.