So, I bought a pack of 25 of the wire straps and took a chance that I could shorten the 9 hole ones to make them look right. It turned out the 9 hole straps are actually 1/2 inch longer than the original 7 hole straps and the holes line up exactly. Cutting off the last 2 holes gave me a strap the same length as the originals. See pic. Looks great in the car.
Terry