I punched on Clinto's (correct fuel filter gasket) and I'm supposing him to be correct on that one.....I'll just add that my recent primary filter change had me taking off the can and as I had a box of filters supplied when I got the Deuce, found both narrow and wide gaskets along with the filters, as well as different diameter in narrow and wide.....well upon re-assembly of the primary I wanted to put the new gaskets on for good measure since I had them, and re-use to me sounded risky. I found that I only had wide gaskets for the primary and that my particular (White) multifuel configuration used the narrow. I'm glad I failed to take and fish the gasket out with some auwl or some sharp what-not, because I'd have likely destroyed it. I got hip to that scenario changing filters on the side of the motor, the two oil filters, where I did monkey up the gasket prying them out. Luckily I had both narrow and wide for replacements and was able to use the new gaskets without problems. The thing is.....make sure that what your replacing is the proper width and diamiter, ie. narrow or wide.