63 Drop Top is right. You should be able to get motor mounts at your local parts store, or they should be able to get them for you if they don't have them in stock.
I was new to working on my car in the last couple of years. If you are new to all this, try to remember that sometimes at auto parts stores, some of the counter people aren't that helpful, and will somtimes know little or nothing about a fourty year old car. But if you keep trying, you usually can get what you are looking for. See if there is a store where the people are knowledgeable and if you aren't getting what you need, ask if anyone there works on classic cars. Those are the guys that usually will go out of their way to help you out.
Good Luck,
Ryan