Stuart: 40 seconds? To check
lil' B's profile for having a'55 or to find the part? Or, both?
$21 plus shipping (per shaft) - use part number RS602 on the Parts America page (linking to their parts in their catalog does not work).
The Jim Carter price on this item (which was posted a few days ago) is a good enough price, even with shipping.
I bet if someone finds a NAPA part number, the cost will be higher there (and, my local NAPAs now charge shipping if it is not in a local warehouse).
Tim