582 coolant thermostat

[JustPlaneMike]

Yes it is a flat sided ring. They are a special design with a grove to hold the thermostat. You will need one to install your thermostat. I got mine at Rotech Research Canada Ltd in Vernon BC. 1 250 260-6299.

You can look up the parts at this link. It varies by model number.

https://www.leadingedgeairfoils.com/...582/582ul.html

Thanks I was able to track down the part number, Rotax Gasket for the 583 -90 Gray head is 230-800. Ref the thermostat, Rotax is $130+ so I'm going with / try the part number 18-3558, napa and others use this same part number.
Next thinking of research into for an aluminum radiator.