I think the part you want is 2291095

A couple of links for you to see what it looks like.

https://bluestarperformance.com/par...r-blower-switch-2291095-1963-65-nos.html

https://www.ebay.com/itm/NOS-Mopar-...ow-Defogger-Switch-2291095-/333330986612

Not sure you can fix what you have. Also not sure if this is a switch with two speeds or a rheostat, probably a switch, the parts manual calls it a switch. So you probably have 12V in and then either no output (off), 12v out to the resistor pack on the heater box for low speed and 12v out to the motor for high. Two speed blower in this case, looking at the wiring diagrams, that is what it looks like.

You can get botht eh FSM and parts manual in electronic format here http://www.mymopar.com/index.php?pid=31