This bolt-on trailer hitch fits BOTH '68-'69 and '70-'72 Skylarks/GS's. This was on a '70 GS 350 I purchased years ago. The horizontal bar reverses (180 degrees) and also bolts onto the '68-'69 models (concave bumper contour) ... I used it for a summer on my '68 GS 350 to tow a small boat. The materials are heavy ... the horizontal bar is 3/8" steel and the tongue is 1/2" or 5/8" thick. Bolts shown are included and fastens to frame rails and bumper. $35 plus shipping. - Ken
Here's a pic I found with the same hitch on the '68 GS about 10 years ago. I sent a PM with the shipping info.