Real Deal Rear Tow Hooks? What Are They Worth?

[Ironhorse]

Recently got these hooks in a parts deal and I believe them to be the "real deal" accessory rear tow hooks offered by GM dealers but not optioned from the factory. They are beefy at 6 lbs. each, 6 1/2" long, 4" wide at rear of base and 5" tall. Bolt holes are 5/8" dia, 2 3/4" C to C at rear and measure 4 3/4" C to C angle measured from single front hole to rear double holes. Looked at the thread board member "dazza" posted in the 67-72 parts forum (Tow Hooks-reear) and these seem identical to me. No weld or cut marks, could use a media blast and repaint. Looking for some other opinions here before I post for sale. Also would like a $$ value for them. Will offer in the parts forum after some hopefully returned feedback.