Are there two different sizes on the Shifter? I ordered two of them a while ago and when i went to install them they were too large for the bore. These are for the rear shifter rails. I tried to kind of seal it by putting a piece of sheetmetal behind the bores and seal it, but today when i was shifting my little fix popped out with teh quickness. So i need to find a smaller end cap to keep the oil in the tranny.