It was homemade by me on my Big Red here is the best picture I can find. The holes are plugged with foam in this picture for winter open in summer but didn't let near enough air thru to help I didn't think. If I remember correct there were 5 - 1"X 6" holes
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I've been eyeing up this split and vented windshield on sxsstuff.com. I haven't seen anybody on here review one yet. The bottom vents look really nice
Honda Pioneer 1000 Two Piece Windshield: SideBySideStuff.com