I didn't like the dipstick tube as well. It is a press in style off of a 72. I ended up drilling it out and flipping the inside piece of the dipstick retainer over and drilled it out and tapped it with a 1/4 NPT tap and got a Mr Gasket braided dipstick with the 1/4 NPT fitting on it. Welded some 1/4 inch nuts inside the oil pan and put some gasket sealer on and bolted it in. Ken