hehe, yeah I learned the hard way. The nut on the 97' IS bigger. I borrowed the tool from a shop in San Marino. Luckily I did, I gotta get me one of those wrenches. Reason is even after you take it off, you still have to tighten the nut. I'd rather use the wrench rather than tear up the nut when tightening it down. So the clutch fan on the 97' D90 is a lot different AND the thread does come off counter clockwise, unlike the 93 110, 94 & 95 D90.