1994 Yukon torsion bar mounts

[chwkyukon]

After taking my car to a mechanic for a popping sound while turning and a creaky groan while breaking at low speeds I've found out my torsion bar mounts are worn out. They want $300 to replace them. I'm confident enough to replace them, with the help of a friend, but I can't find them anywhere. My local auto parts store can't find them, I've looked at summit and jegs, as well as many other sites with no luck. The only place that I found that may have them is classic industries, and they only have one. Can someone give me a part number, or a supplier? Is this a dealer only part?

Thanks for your help in advance.