So far iv removed backing plates 10 x 2.5 from a 7 1/4 and 8 1/4 and havnt seen a pair without the 5th hole.I just did the conversion,the only thing i can comment about is to make sure you get the shoes that work with your hardware style[parking brake]..some of the early shoes use a round pin for the parking brake brkt mount and the later style uses a slot and so the brkt is different along with the strut bar..also the springs are a little different..the early style [round pin ]uses a long spring and a short spring at the top and the later slot style shoes use two long springs at the top..if you order[i did] a spring kit,the only ones i found do not supply the two long springs only a long and a short[pin type mt]u need two long springs for the later style shoe[slot] which you can order seperate...the shops iv bot shoes from like to supply the shoes with the slot instead of the shoes you mite need[pin]...rockauto lists pin type shoe as 333 if i remember rite and slot shoes as 444..so when you need shoes you have to be specific as to what style you have..both style shoe will work on the same back plate..the p brake hardware is the determining factor..ANY QUESTIONS..LOLOLOL..drums work also..good luck..j
