I need to find the appropriate driveshaft seal at the rear of my 5 speed transmission. This is the seal right where the driveshaft slips into the extension housing on the back of the trans. I have a 1992 4.9L F-150 2WD with the Mazda R5OD trans. I have looked around at Rockauto and Ford part sites, and they are confusing because there are so many different part # options. Everything I have found has been for the zf trans.