looking for a source of two lead variable resistors

I am looking for some trimmer resistors that come with only two leads.

This type of variable resistor is basically wired like a rheostat, where one of the ends is shorted to the wiper internally.

Some old CB radios used to use this type of trimmer, but i haven't been able to find a modern source for them.

the difficulty comes in because of the 'looseness' of the terminology used in selling these types of items.

so, does anyone know where to find these elusive...

looking for a source of two lead variable resistors