I purchased a 1968 1800S in 2016 and I’ve been slowly restoring it. it wasn’t pieces when I got it and now I’m slowly finding some of the stuff that I’m missing. I am currently looking for the correct bell housing, I know that I have a hydraulic clutch but I’ve looked at a few bell housings on eBay and I don’t know if there were differences between model years or not for the B20 motor with the M41 transmission. from what I’ve read online this is not the original motor as a 1968 should have a B18. eBay has a link That you can press to tell you whether or not the parts will fit your car. And so far every time I press the Link for the hydraulic clutch bell housings I find it says it does not fit.

How do I determine which bell housing I need?