4.75" bolt pattern??

I know at times I am not the brightest bulb on the tree. But I do know that you only learn by asking. On FleaBay there are these adapters I came across (I do not need them) but it mentions SBP to 4.75" pattern.
Am I missing something here?
http://cgi.ebay.com/ebaymotors/mopa...ies?hash=item35a2d9805d&_trksid=p4506.c0.m245