It's not actually the bellhousing, it's the case of the gearbox. Where the selector rod enters the housing you basically are drilling through the end of the shaft boss, remove the shaft, fit a seal to the original hole and fit the shaft to the new hole. As commented above, take a look and see if there is a seal mounted along the line of the shaft - if so, it's an MR2 box converted to FWD duties. You Are A Winner! All you need to do is (carefully) ease the seal out, restore the selector shaft to its original and proper location, and fit the seal to the hole.