This adapter will allow a T5 to bolt up to the 4200 automatic bell housing. Note the 4 transmission bolt hole need to be drilled/tapped by the installer - this allows the transmission to be tilted if needed.
The plate has provision to install a GM pivot ball for the clutch fork. The bell will need a hole added to install the fork - nothing that a hole saw won't take care of. Alternatively a self aligning hydraulic slave that mounts on the input shaft could be used - your choice. The adapter is cut from 3/4" Aluminum plate. The bell housing depth puts the transmission 1/8" further from back the engine than a normal GM bell which still allows plenty of pilot engagement.
If you need to install a different trans (non-T5) email me with the transmission bolt pattern/bearing retainer OD and a different adapter can be made.
Another reason not to use a 4200 just evaporated....