Here is a Pair of New Door Strikers (One Left & One Right) for your 1956 - 1960. Please verify that you need a 3 bolt striker there is a 2 bolt striker on certain models, the 2 bolt strikers are not being reproduced. This will do 2 doors... you will need another set to do all 4 Doors.  We also offer the door striker Shims & Bolts in our other listings. These get worn out of years of abuse opening and closing of the doors. These will not work on 75 Series Cadillac's.