Looking to buy the two switches on a 70 Disk/Drum proportioning valve

[Jalaska907]

Hey everyone,  I'm looking to buy both switches that are on the proportioning valve on a 70 challenger with disk front, drum rear brakes.  One switch is on the proportioning valve, and is for the brake warning light.  The other switch is on the metering block (believe that's what its called)  and i'm not 100% sure what it is used for.  Thanks for the help