I bought the Sylvania H5006 low beam bulbs for my 69' chevelle but they don't fit into the headlight buckets right. The notches on the bulbs are supposed to fit into the notches on the buckets but they don't but the H5001 high beams do. The autoparts person (don't start!) said my car calls for the H5006. I haven't had this car together in over 10 years so I forgot what bulbs I used before. Is it because they are halogen or are they supposed to not fit into the notches?. Which bulbs do you guys use.