Not on my SPID, but when my Dad special ordered my 71 Jimmy on Dec 30, 1970 he ordered the extreme hooks with it. After ordering the dealer called him and said the hooks would not fit the frame on a 71. He would have to wait for a 72 truck. So he told them to put the hooks in a box and bring them with the truck. He got the call on March 31, 1971 that the truck hauling his Jimmy in was due later that day. Sure enough, both hooks in a box, but bent the same direction. He heated one of them up, and bent it the other way. This thread makes me think the bean counters really messed up not making symmetrical hooks available. FWIW, the extreme hooks bolted right into the 71 frame, and have been on there ever since.
Erik
I'm sad to report that my best picture in the last 3 years of the front end is when it was on the trailer coming to my house after 14 years in a barn.
And for good measure, this shot shows how they're not quite symmetrical due to his heat & bend method: