Update. I took my Stellings and Hellings air cleaner to Jegs for a little air filter fitting. The 9" will not fit. There is a 8.25" x 2.5" filter that will fit. But there again we are down to less than 450 CFM.
Doing a search I found the following that would fit:
part# o.d. i.d. h.
E-2570 8.188 6.25 1.875
E-2600 8.188 6.25 2.188
E-1025 8.25 6.875 2.5
I have emailed K&N for CFM ratings and will post when received.
By the way, the E-2570 is the stock replacement filter for a 1988 Yugo GVS! Yugo Cobra????
I think what I will do is stack them for everyday use and take one off for those moments where I am looking for the stock look.
Rick