474733 is a distributors PN for the GM Frigidaire 9956914 seal kit, which included the bellow seal and seat, (reference 5041 in blue). There are several options for this kit out on ebay.
The full seal repair kit was PN 9956935 (reference 504, in yellow), which included 9956914, as well as the seal holder, screws, etc. Original PN for the whole kit was 6599325.
If the outer water bellows (PN 638860, there are plenty out there) does not have a hole in it, at a minimum the 9956914 seal should be replaced, if not the whole assembly of 9956935. While not required a water and oil bellows plier set will make removing the snap rings for both bellows much easier, which will be required to get to the seal assembly.
All PNs can/should be searched for by adding either the WCI 530 reference in front of the 7 digit PN, or 5300 in front of the 6 digit PN.
Ben[this post was last edited: 4/26/2021-12:23]
