Anyone Use 275/60-15 BFG TAs with Cragar Series 61C Cragar SS on Their Duster?

We are installing a 71 340 block in my 1973 Duster. We are having a very hard time locating a driver’s side motor mount which is pretty unique.
Any idea where I can find this motor mount?
Thank you in advance.

I think Schumacher is the only one that makes them, they appear to be sold out '73+ A,B,C,F,M,J-Body 273/318 or 340/360 Replacement Kit

The 318 mounts work, you just need to add a spacer between the ear on the block and the mount because the mount is wider on the 318. I suppose you could also split the 318 mount, removed the 1/2" or so of extra width and weld it back together if you were so inclined.