Any tranny filter with a good gasket will be fine. Since they only filter out the big particles anyway, there is very little difference. If the filter has been changed in the last 20K miles, I wouldn't even worry about doing it - have it flushed and then add the inline filter. Dropping the pan is a major PITA as teh crossmember must be removed along with some sensor wiring. I'm SOOOOO looking forward to NOT having to do Lisa's pan filter changes anymore - the inline filter takes 5 minutes and doesn't flood the garage with fluid!