Proper crossmember for sm465 2spd 2wd

[Myoldtruck]

I currently have a 1970 c/10 with 350/3spd on the floor. The sincros on 3rd gear are going bad. I picked up a sm465 that was originaly in a 1970 c/20. I got the bell housing and floor pan for it also.

The 3spd trans is using a standard type cross member at the rear of the trans. The sm465 doesnt have any thing on the rear of the trans for a rubber mount. Im assuming their is another way the bell housing mounts for support closer to the engine. Any input or pictures would be a big help.