Is there a name for this part?

'stem extension that is used to convert from threaded to threadless forks'

This thing?

Thanks a bunch. That may be what I'm looking for. The reason for asking is because I bought a Soma frame and asked the lbs to transfer the parts from my Trek 1200 to the new frame. Everything worked except the fork. It had been cut by Trek and is too short for the new frame, so I had to order another fork on the spot. Two hundred and fifty dollars I wasn't planning on spending.

A poster on another BB suggested using what I think you posted so I will suggest it to the lbs tomorrow. Thanks much.