904 transmission pan gasket

Those holes are for a factory floor shifter bracket. If the fluid is running down from the front of the holes it'd either the extension housing seal or the rear band shaft seal is leaking. To replace the rear band shaft seal you need to remove the extension housing and screw a 1/4" bolt into the pin and pull it out just far enough to replace the o-ring. Don't pull it out any farther than necessary to replace the o-ring or you'll let the rear band linkage fall apart inside
After replacing the speedometer housing seals twice and a nee pan and factory gasket which is now sealed well I am still leaking at that floor shifter baracket holes. I am not an expert on trans and want to know more about the two places you are referring to. So is the first place you are mentioning large tail assembly gasket? I was told this trans was rebuilt but I am starting to doubt it.