Orion item number 05124 (for 2 inch eyepieces).
"Eyepiece Extension Tubes
These anodized, machined aluminum tubes provide extra focuser "back travel" sometimes needed to achieve focus with certain eyepiece/telescope combinations. Often needed for short-range terrestrial viewing or with use of a field flattener, coma corrector, or focal reducer lens. Two locking thumbscrews. Threaded for filters."
In brand new condition - $17.00 shipped - I prefer paypal (no extra fee).
Thanks for looking,