Up for sale here is this NOS vintage Ungar soldering iron tip.  It is guaranteed to work great for you.

US shipping and handling is $6, and international is $20, no matter what quantity you buy. All my small parts are set up for combined shipping--just use the "add to cart" feature, then check out at once to receive the combined shipping discount. If you have any questions, please ask.

I have more parts and other vintage electronics listed--feel free to take a look!