Competition Engineering----used them on my 73---they were the red colored bushings with bolts & washers. be careful on the front ones under the radiator support if you are running an aluminium radiator. The rad won't take much flexing before it will leak. Take off the upper plate holding the rad in it's position so it can move a little while you jack the body to get the bushings in.
I just got my Prothane kit in from Amazon. It's a very nice complete kit. I'm finding on a lot of parts Amazon is cheaper than Summit. I just bought a gas tank and saved $36 plus summit wanted $40 more for oversize shipping. That's $76 saved on just one part.
I like ordering from Amazon with my prime membership so no minimum $99 order like on Summit for free shipping. I don't work for Amazon, just every buck counts and if I can tell others about it we can all benefit.