The one thing I don't like about my 500 trail, are the holes all through the cabin.  Dust dirt, and rocks always enter the cabin from these holes and would clog up the seatbelt latches, retractor etc.  Imagine going for a ride, but then you can't undo the seat belt.  I contacted CFMoto and asked what they recommend.  They could only say there have been a lot of complaints and they are considering covering all the holes in later models.  So I've tried Sheetmetal with rivets.  Mostly worked.  I've tried metal duct tape.  Meh.  I'm going to try rubber mats next. Anyone over come this issue?  I have Dirt Specialties doors, and the poly front and rear windshields. Dust is big issue here. I got rid of the seatbelts and put in harnesses.  Much better and never get stuck. 

[2015 Z Force 800 53/Trail EPS]

I cut chunks of memory foam, stuffed it in all the holes...and there is more then you think..then shot some black spray paint on it to help it blend in. Works..and been working for 7 years now. I also put a boot on the E-Brake and sealed the grill between the seats...after moving the air intake. Helps.