The brackets are repo'd. Corvettes used the T-10 until mid 1963. Late 63-up used the Muncie. Here's the T-10 bracket: https://www.ecklerscorvette.com/196...t-kit-with-t-10-transmission-25-187585-1.html I'm not seeing a repo T-10 switch tho, just the later Muncie switches.
I have one for 65 GS. Brackets (three pieces and bolts), NOS rubber dipped switch with female bullet terminals (pliable) and rod. Let me know if you want pics, and I'll get them in the morning.