Try A-1 Foam at 8040 SE Stark near I-205 in Portland (503) 255-4117). The owner is close to retiring, so his hours vary, but that is where I got a custom cut piece of foam to match the FWC foam. I'm not sure if he can do covers, but there are others who can. I recall it took about 5 days for the special order; if you do order, be sure to call when it is due in to see if it has arrived.
Edited by Jack, 02 September 2021 - 11:27 PM.