I'm trying to figure out which type of motor mount I need for my '53 Manhattan. I am looking at several different parts vendors, original parts manuals, and my own car. All of which are giving me conflicting information. There seems to be two types of mount. One type has a slot cut out of the bottom of the mount like the first picture below. The second type is solid like the second picture below. My car currently has the solid type. However, all of the manuals and vendors are giving me mixed up part numbers for the mounts. Some places say I need one part number and others say I need the other part number. So which is it? And what part number corresponds to which type of mount? Are they interchangeable?
P.S. The two part numbers I am finding are 207406 and 213100. But I cannot find illustrations confirming which part number goes with which type.