I got this OAG
click here and followed some of
these DIY steps, I only had to grind the slot in the T adapter T2 thread to alow the prism stalk to pass through. The bayonet adapter in my OAG sits inside the OAG body, adding no extra length so I did not have to turn it down on a lathe. Only other thing to get was
this M48 to T2 adapter ring.
The OAG replaces the celestron t-ring on the end of the HD T- adapter and is very similar in size (T-ring 10.78 mm OAG 11.18mm) The pick off prism can't be rotated like on the celestron OAG surely making it harder to find a guide star however, the Lodestar camera had no problems.