Nate,
You may be in luck.
The 250 mounts are different for the DS and PS. The DS mount from 250 is the same as 292 DS mount.
The 292 uses the same mount on both PS and DS of engine. Only difference is the PS mount gets 2 short pipe spacers to fill the void between block and mount. Cut those with a hacksaw or better yet a SAWZALL. (don't tell T6 you used a SAWZALL).
I would buy your extra mounts. Tom
