I looked high and low for Autolite and AC spark plugs here in England and came up with nothing unless I want to buy from USA and pay huge freight costs. I can get the NGK here. So I am stuck with those. The car industry in England is geared to European modern cars or older English cars. Tell them you have a 1937 Plymouth and they say right away, 'No we don't stock anything for you.' I seem to remember in Minnesota, 10,000 Auto Part store would say let me check around. Even if it was an English Mini or MG. That doesn't happen here.
I have ruled out Champion, thanks to Plymouthy Adam's humor reminding me about them. It reminded me of my 20's and my 1965 Slant 6 Barracuda where several new plugs went a foul.
This is my 1st classic car and I now am faced with learning old school all over again with the help of a bunch of great guys on this forum who give of their time and experience. Thanks Guys!