Engine Shock Mount Replacement

[Skymaster337B]

I'm looking for help with engine shock mount part numbers, for a 67' model. My parts manual shows shock mount kit# J-9613-31, but only for the front engine front mounts, and the rear engine aft mounts. The front engine aft mounts, and the rear engine forward mounts are not listed. So are all four engine mounts the same? They certainly don't look like it. I'd appreciate any help with engine shock mount part numbers...especially the front engine aft mounts and rear engine forward mounts.