These are interesting!

[m3a1]

Spark plug adaptors! Never seen such a thing.

Not mine.

https://www.ebay.com/itm/274397709604?h ... Swg95d6Z8A

[m75]

Plastic ones have been available for a little while, and at a much more Christmas-friendly price. Previous thread here on the site somewhere.

[rickf]

I just posted on these not long ago after talking with john Bizal to make sure they were available. I will be getting a set for mine eventually. And the military also had them available.

[rupert's]

I have seen them in avaparts a long time ago, but I have not bought them, on this page they cost € 11.90 each ... But they are in the Czech Republic.
Maybe the next time I buy on this website I will put them in the basket. All the best

https://www.ava-parts.cz/produkt/navlek-na-svicku/

[Horst]

I got mine many years ago. And used them with those Bosch platinum plugs. Big question why. Later on I installed a new set of NOS plugs and I have another spare set. Through how many sets of plugs will I ever go? Nobody except George needs any of those adapters.

[rickf]

Spark plugs on these old engines don't last like the newer cars. Old school plugs, they do wear out unlike the new style plugs.

[Hambone]

These are available for $20ea., sparkplug included, I think I have seen them cheaper somewhere.

[kwb]

I got a set of spark plug adapters from Midwest military .com $30.00 each Just make sure the plug is tight in the adapter for proper heat transfer.