did you test fit the new tubes into the holes? they are a press fit, if the new tubes are a tight fit all is good. If the tubes fall in the hole because it is too big, you may have to stake the metal around the hole with a punch or carefully use red locktite, or maybe both. Just make sure if you use a sealer, it's not affected by gasoline. Cliff may have a better solution if the hole is oversize. Good luck.