63-66 idler arm conversion to late model thru bolt ?

Previous owner on my car had the late model idler arm on my early k frame. They simply had used a bolt where the tapered pin on the proper style would fit into the "biscuit" on the frame .

While it drove fine like this it did put the passenger side wheel approximately 3/4 of an inch closer to the front edge of the fender than the driver side wheel. The alignment was totally jacked up. I guess it could have been fixed by running an adjustable strut rod on that side , but frankly it was redneck sloppy.

Replaced with the proper idler arm from PST and the car came down to a within .1 degree alignment on the hunter rack.