My point Vikki was that one of the mfg of the round bulbs do not put a long enough prong on the back of the bulbs. The books/computers will all tell you that they will fit (which they do) but what they don't tell you is that due to the short prongs, if you have stock wiring, they will not work without modifying the plastic boots on your wiring harness. Whereas the ones with the longer prongs will work with no modification (cutting/trimming)...