I tried to research this but I didn't find quite what I was looking for. My 01 WR426 has a crack at the top of the tank and I need a new one. I have figured out that I don't want a Clarke because I have to buy a YZ seat. So it is either IMS or Accerbis. Which fits better? What size should I get a 3.4 or 4.0 gallon. I don't do a lot of long distance riding other than on the road with the SM setup. The 4.0 would be nice but I don't want this huge tank looking like some ugly piece of plastic taking over my bike. I priced out the 4.0 IMS for $250.00, not sure on Accerbis.