Stated 'OEM'.

No affil.

ALTEC A7 CABINET MOUNTS ALTEC 515B 416 802 288 PAIR OEM - eBay (item 250744968501 end time Jan-18-11 10:50:39 PST)

Now, what's interesting, is that the picture used to support (no pun) the use of these in recording studios (Carole King perhaps?), does not show the mounts themselves being used! (as far as I can tell)