Lightolier does sell replacement thermal protectors and some Juno cans use the same device.
Lightolier part number = 1970
Juno part number = S599
As others said it is probably best to just purchase a new housing/frame instead of spending the time to find the replacement part. You should be able to find a 1002P1 or 1102P1 housing for less than $15.
Curt
