Rocky,
When you say "Four Bar Type" do you mean a rubber/poly insert type? The first picture below is a 4-Bar end on my coupe:

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The second one is the end on a the ladder bar on the roadster.

DSC01317.JPG

Both are Pete & Jake's components, and I wouldn't change either one from what's shown. A solid Heim type is going to transmit vibration and noise, IMO.