70 GTO Transmission damaged and leak
First I wanna start and say when I got the car from my uncle it wasn't running. I had to change couple of stuff for the car is running. Also I found out that oem transmission filler tube is bend and leaking bad. There are two types of seals, o-ring and a rubber sleeve type seal depend on your filler tube style I guess. My TH350 filler tube had the rubber sleeve . I ordered the rubber sleeve online and bought Mr. Gasket. Filler tube Found out it has the o-ring. The Mr. Gasket tube tip is thicker then oem that's why it has O-ring and oem skinny and have rubber sleeve. To make the story short I installed the Mr.gasket with O-ring. Filed the transmission fluid car ran once I turned it off and let it set fluid started leaking I think from the dipstick. Is it because it's cheap brand and O-ring isn't sealing well? Should I switch to the rubber sleeve kind? Should I keep it and add ultra grey gasket maker and let it dry over night?
Or should I buy this dipstick?