Do you need brake shoes(drum brakes) or brake pads(disc brakes)? Most auto parts should be able to order new lined shoes, if that is what you need, on an exchange basis. Best to verify if it is really a 6000? Series or whatever before searching for parts.

The 'heat flap' is designed for warming up and keeping carb. ice from forming, if you get a service manual for eBay or such, it should show pictures.

Ed



'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.