Old seatbelt switch wires:72-73

[njoconnor]

With the original belts long trashed and the seat switches yanked during the reupholstering, I'm left with two sets of black/white wires which I'd like to eliminate (the power feeds to the seat/belt switches. It appears the handbrake indicator light and the hazard switch may both get power through the seat belt warning lightsocket. Does this make sense? And since I'm searching for a good power supply wire for the new radio, any thoughts on using the power off the old seat switches?

Btw....i have a very clear original 72 North American Spider wiring diagram if any one needs a copy.....

Neil