Originally Posted by dannymrmissile

Hi. Not sure which kit version you’re working on here. The BT-60 kit simply uses a standard 24Mm mount, or the OD of the BT is 1.637. Not sure of ID. Length can vary depending on using D or E engine. The others are from the BT-50 tube and 0.976 OD. ,,, or 18MM standard engine mount. Does this help ? I’ve modified Many types of engine mounts,, even using outside engine hooks to convert a Scrambler from a 3 Engine 18 MM cluster to a single D 24 Mm mount,,, ( think I still have it !). Perhaps I can be of further help. Let me know. Dan. PS, yup, here it is....pics coming.
Just for fun......
Here’s pics. I built this in the early 70s, modified it later. Used makeshift parts.