Look for and use BRASS tools. I have brass screwdrivers and certain size wrenches.
Just an idea.

States heat range for Champion 573 (XMJ20) is---20

Thanks for all the info on the spark plugs, I got a set at O"Reilly's

Any wiper motor? L & R

My question is, are the rear wheel bearing oil bath lubed or should they be packed with grease. I have the 1963 B1 model

I bought a set of the NAPA ones and found the outer washer had to be reamed a little bit to fit over the shoulder of the bolt, wasn't a big deal. Just took my dermal and reamed out each washer.
Thanks for listing the numbers.

Thanks for the part numbers, I am currently replacing all my brake cylinders, this will same me time on running around. Checking the cylinder I notice what may be Very old grease (?) between the boot and the piston.