71 flange is also on the inside. 72 is the first year that slips in from the outside. What I did was kept my original fill tube. Poked a hole in the top on the side and ran a 1/8 pipe tap in . I installed a nipple and ran a braided line down the tibe. All I have is a picture of it after the car was wrecked. Worked fine and the car did not blow up on impact. Can' ask for better then that
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