g741.org

where do you get autolite 2243 spark plugs

unless you already have them or find someone who is willing to part with them, you don't. And if you do find them on ebay or someplace else, the market premiums is astronomical.
Autolite quit making these sparkplugs several years ago so they are not available for new purchase.

However, do not despair gentle G741er! When sufficient need exists, the free market provides! The great material continuum has given us relief in the form of adapter kits! Huzzah!

https://jeep1942.com/?page_id=9592

I am not affiliated with this company and cannot attest to their performance, but this seems like the most cost effective way to take your 24V machine and use standard sparkplugs.

John @ Midwest makes these too.

You might check with aircraft mechanics, but they won't be a bargain in any case.

PoW