Blinker switch GMC-vs-Chevy

[CJ2A]

I decided to to install a new blinker switch in the steering column of my daughters 1963 GMC 1500 PU

I am on my third switch from the same vendor and I was told today, it is a Chevy blinker switch, not a GMC, the part will never work.

The three new repo switches all had different malfunctions.

What I have found all the 1963 Chevy & 1963 GMC pickup have the same wiring (wiring colors and wiring responsibilities). The repo switch plugs directly into the existing wiring System.

Anyone ever experience this with the blinker switch ? I feel like I paid good money for this switch and I should not have to take the switch apart and tweak the wire contacts.

Has anyone tweeked the inter wire contacts of the repo switches to make these repos work ?