I have a couple thoughts:
1) We always made our own "tabs" (the vehicle side bracket) to fit the tow bar we had.
You can see the double clevis is on the tow bar; the single tab extends through the bumper opening after attaching to the bumper bracket/end of frame.
2) There are/were products available commercially, like from Lakewood or from a company called "NMW" for example. Usually applied to Camaros and Novas, I did not prefer these aesthetically as much because having the double clevis on the vehicle looks so much more massive and clunky to me. Of course, painting them orange or yellow probably didn't help.
https://www.yenko.net/forum/showthre...highlight=tabs
https://www.yenko.net/forum/showthre...highlight=tabs
https://www.yenko.net/forum/showthre...highlight=tabs
https://www.yenko.net/forum/showthre...highlight=tabs
https://www.yenko.net/forum/showthre...highlight=tabs
K
(I had a guy rip me a new one for leaving those on there, saying it really wrecked the design of the car)
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'63 LeMans Convertible
'63 Grand Prix
'65 GTO - original, unrestored, Dad was original owner, 5000 original mile Royal Pontiac factory racer
'74 Chevelle - original owner, 9.85 @ 136 mph best
http://www.superchevy.com/features/s...hevy-chevelle/
My Pontiac Story: http://forums.maxperformanceinc.com/...d.php?t=560524
"Intro from an old Assembly Plant Guy":http://67-72chevytrucks.com/vboard/s...d.php?t=342926