Never for 4 shocks will you get this price. They are the 4600's not the 5100's. Tried to research the difference and all I could find is that the 5100's are zinc coated. There may be other differences. Auction is over so the point is mute unless they relist.i could be wrong, but if you pm shock warehouse, or dc special on here they are about the same price or cheaper.
Like I said, these are old stock identical to the 5100 other than the finish. The rears are HD models which are a little stiffer than the 5100. They are valved for towing.I thought the 5100 lifted shocks were silver with black boots... at least mine are. I love Bilsteins, but I couldn't handle the yellow/blue ones.