I'd just go to the salvage yard, I only paid $10.00 for 2 of these caps, the splash shield, and a different type of cap to make the oil access easier on my king quad.
Don't be afraid to dicker with the salvage yards either as they will crush more of these than they will ever sell so don't pay a crap load of money on one.
I screwed up and used a paint pen and it must have run further than I thought, otherwise there would be no gap on top like in the installed picture. I couldn't find my silver sharpie at the time and wanted to get it done.
I can live with the little gap for now as the ease of checking oil is worth it. Plus I can always fill the gap or replace the cover and do it again if needed.
2010 Prowler XTZ 1000-
27" Grim Reaper Tires/Home Made Roof/Arctic Cat Mirror/Quadboss Folding Windshield w/ home made support bar/LED Tail-Brake lights//Venom 4000 lb Winch/Amsteel synthetic line/Home Made Doors/Custom Adjustable Seats/Custom Oh Crap bar for passenger/Tonneau Cover/Fat Max storage Box in bed
Tiger Tail Towing system