Project Truck Update: Mystery Engine Mount Edition

Finally got some work done on the truck. The weather if finally starting the behave for the first time in over a month. It's been either too wet or too cold to work (paint doesn't stick well below about 60 degrees). The truck hasn't fared exceptionally well in that time, either. The water pump has continued to rust and leak away, there's still a slow drain on the battery, and I left some tape on there and it bonded to the paint and I ripped off some new primer when I went to remove the masking tape. Oops.

The motor mounts are ancient and they rubber is as hard a rock, so I decided to change them out.

I took the pressure off the mounts by using a bottle jack, undid the bolts (VERY hard to access), and removed the motor mounts.

This is what they looked like:


Which is a problem because this is what NAPA said a 1980 C-10 motor (donor engine) mount should look like (upper half only):

I need to go out and find the right motor mount now. Any ideas on what motor mount I should ask for? I'm pretty sure this truck originally came with a straight-6, not a V-8.

Also, FYI- a set of motor mounts should last most vehicles 100,000+ miles or at least a decade. These things are just ancient and it's one more thing contributing to the engine running rough.