We have 4-40 links by Dubro with captured end links. Some guys use Traxxas and then get close on the size with adjustable rod end from Traxxas or RPM. Bring in what you’re working on, and we’ll be glad to help you out.
They have several employees that enjoy rock crawling. I am sure they can help
I can't ever remember seeing them when I've been there. Although the parts walls can be a bit overwhelming at first.
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