[ARC5] Tube entenders

[Bob]

I think that this is the right forum to find answers for my lack of experience.I am not sure if they were even ever made as I am a relative newcomer but as I am now playing around with different boatanchors( ART-13& DX 100's etc.) I can see the sometimes need for tube extenders for 7 pin 1625 and 837 tubes. 4 pin 811's and 7 pin 813's (which have a different pin circle diameter than the 1625 type). The base of these sockets are sometimes hard to get at.If there are such things and anyone has any of these that they no longer have a use for I would like to purchase them.
Thanks in advance.
Bob 
W1GTH