Rear Glass and Plug the Holes
I just got an XP 900 - front and back glass, no doors. Put the machine to work and noticed immediately a lot of dust / debris coming in from behind the seats. Got to work plugging, sealing, taping all the various openings. Gave it a test drive and noted a significant reduction in the cab dust. Now I see what dust / debris that is coming into the cab is from the lower door openings as blow in off the front wheels; this I will accept as the trade off for not using doors. There is a cab seal kit option - its about $285 and you need to disassemble a lot of stuff. The kit does address the front openings... which in my effort did not. I used a combination of Gorilla tape and black silicon caulk to seal up the gap under / behind the seats. Noted in the factory cab seal kit video, the spots where they did not fill in with the cut foam pieces, they taped them. For $20 in tape and caulk, I thought I'd give it the DIY seal.