Pivot Shoe Dimensions and Replacement

I would like to order replacement pivot shoes for some of my windows, which are equipped with 29" spiral balances. My measurements of a pivot foot (originally installed) and still in use would seem to indicate either part numbers 15-046 or 15-047. All current pivot shoes have a cream colored acceptor for the pivot bar, as opposed to black. Are pivot shoes color coded similar to the spiral balance tips, and therefore my need would be #15-046? Thank you!