Square Body Tow Hooks - 3 Options?

[Ironhorse]

Pretty much everyone who is familiar with the square body trucks from '73-'87 knows when the truck body changes were made in '88 for the newer GMT400 series. Also after the then known as the RV series instead of the previously designated C and K lettered series. The beefy robust 73-80 " J " looking tow hooks and the more slender looking '81-'87 " S " looking tow hooks.

Recently have come across an additional style which to me apparently combines the robust beefy dimensions of the 73-80 hooks and the more slender style of the 81-87 type. Never seen these before until just last year when I found a pair and knew nothing about them. Since then have done a bit of research altho not an authority by no means. The pics below show the three styles with the 73-80 (Left) - 81-87 (center) - and the combined style of both in the third hook ('88 & newer RV series ) to the right. One can see the bolt holes of the larger hooks line up completely to the 81-87 hooks. From what I can find the larger hooks were offered for the 88 and up RV series one ton trucks but....should fit with the 81-87 trucks.

Dimensions of the J hooks are: a 5/8'' dia. bolt hole, 1'' round hook and the part # 328072.

The S style hooks are: a 9/16'' dia. bolt hole, 15/16'' round hook and do not find a part number.

The combined style have a square shank curved to match the S style hook, a 5/8'' dia. bolt hole and the 1'' round hook. Left side has the #14029217 and right side #14029218.

Have not found out a lot of info one the combination style but it was an option on the GMT400 trucks and can possibly be used on the earlier square body trucks? Any comments or related info is much appreciated. The left and center hooks belong to my BIL (member old wagon) and the far right hand hooks I recently acquired. From what I can find they were normally used on the one ton 4x4s which would make since as a heavier truck and frame. They will be offered on the parts board at some point shortly as I am a 67-72 guy. Just thought I would share some interesting info that I have found. As mentioned, comments or further info is appreciated.