The International Cessna 170 Association

I have a 1949 170A & I was thinking about changing the hardware that attaches the tailwheel spring to the fuselage, numbers 100-105 in figure 22 on page 38 of the parts manual. The bolt and nut (#100 & 105) are readily available. The retainer, #103 was available on ebay. The bushing, #102 is...

I would like to put an external power receptacle in my 170A. I can get the receptacle from Aircraft Spruce. Does anyone know where I can get the bracket for putting it on the firewall? Is there a kit available? What do I need to get FAA approval? Any help would be greatly appreciated. - Jim