I took my stock tank out 17oz, and replaced it with a Dubro 14 oz tank. The 16 would have gone with some grinding and effort, but the 14 slid right in and with a twist it sits nicely in the formers in the front, right up against the firewall. I put it in with the tang or tab to the top and the stopper to the bottom. The stopper hole lines right up with the original hole, so no need to drill new holes in the firewall this way. 14 ounces is plenty for me, thats 82% of the big tank that was in there. I traced with a marker where the old tank was on the side of the fuselage and placed the new tank over that tracing and I estimate approximately overall the fuel load is approximately 50% lower. As posted above, there is 1/2" difference in the centerlines of the tanks, but that is only part of the picture. The stock tank is not installed in a centerline, it is at an angle, with the large percentage of the fuel above the tank centerline on the stock tank, so the difference is greater than 1/2". I am confident that it is not too high at this point.