okay, I tried today to make a fuel filler neck like the newer cars with a smaller hole. I cut some flat stock, left tabs on either side (for support). One large and one smaller. Then sliced into the neck with my sawsall halfway on one side and small notch with dremmel on the other. Slid the disk in for test fit, then cut the hole, and welded it in. My welds weren't too pretty so I ground them smooth. Here it is: what do ya think? Havn't installed it yet... Hope it works.