Among others, this is a very common seal on Euro cars, you have probably seen it on some GM and Aisin boxes The car I am doing has a Getrag F35 FWD trans with a Torsen diff in it and uses the same seal as the Aisin automatics.
No problem outside the car but when installed its a huge PITA to do, this is what I am trying to avoid.
They use hardened press in (wheel type) studs for the pipe off the cat, they are only 8mm but the press in end is 10mm.
The things are rotten to the point the stud is badly eroded and breaks no matter how hot you get it. It is in a tight spot to drill and harder than stone HSS bits just slide around, I made a jig and get them with cobalt bits alright but it always cost me about 3 bits and an hour or more. You have to drill it 10mm to clear all the old stud out not just big enough for a 8mm tap, do that and the bloody tap breaks off.
So now you need to find old VW air boxer studs that are 10x1.5 on one end and 8x1.25 on the other and tap it for 10mm, there is no room to get a nut and washer in there once the pipe is up. The pipe uses a 8mm elongated hole with little room for error, sure you can hack it out bigger but then the gasket slides and you have a leak in a short time. A nightmare of what should be an otherwise simple job turned into a fiasco.
So what I am looking to do is once the jack shaft is out go right in the same way with the expandable 44mm bushing puller and long slide hammer to yank it out (got that, works fine) but getting it back in is the problem, the tooling is just too dam wobbly so I need to make one with an inner cone end and a handle long enough to get past the pipe and turbo pipe, the jack shaft is 16" so I think 18" would get me there on these and make a shorter handle for the other side maybe 12". There is no more factory tools available even used for these old timers, they were plastic and long gone, they also took into account of dropping the pipe. I do a more of these now than ever, the cars are aging and they leak and with a not so easy to check fluid level I am seeing more blown units due to fluid loss.
This is the animal, almost 54mm at the flange.