Help needed

"Just me" but I would not pay 250 bucks for what amounts to ONE "correct" mount. You can shim the 318 mount, it will work fine.

From the 73 service manual, engine section (9) You may? have them swapped left to right. They should have the part numbers stamped on them. These should be factory mounts, and should be available through parts stores. The only ones I know of commonly available are for a 318 and do need to be shimmed on the one ear on the driver side mount engine ear

This

1973 Dodge Dart Parts | Engine | Engine Mounts | Classic Industries

shows # 2325 as right side (passenger) and 2326 as LH (drivers) "V8" They show these fitting both 318 and 360 which is "not quite" true. They will work if you bend the driver side ear or shim it with spacer/ washers

frontmounts.jpg

mountrear.jpg