Here's one thing I know is American made. Energy Suspension.
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These are my new leaf spring bushing set. Now, I did a very thorough search for the correct set. Ener. Sus. said these were for '67-'88 leaf spring bushings for GM full size trucks. They said they measure 1 3/8". These measure somewhat less than 1 3/8", more like 1 1/4" - 5/16" Not a solid 3/8". Now, the one's for the K10 4x4 measure 1 1/2". I have had a problem with Ener. Sus. putting the wrong bushings in the right bag. I hope this isn't another one of those times. Well, better to send them back and switch them out now, here at the house, than when the truck is in the shop and I'm paying for storage waiting for parts.
Do ya'll know what size your eye measures, you guys with K5, K10, 4x4? I can't get a good measurement on mine unless I take one leaf spring end loose, push the bushings out and measure the eye. Just eyeballing them, mine look bigger. I wouldn't be surprised if I had the 1 1/2" leaf's, one's for a 4x4. Why? Because my truck has been strange like that. Stuff that's not usually on a light duty pickup is on mine, from the factory.
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Here's the part number for these if any of you would want a set for your truck.
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Well, heck. I was hoping the instruction sheet would come out clearer than this.
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And this pic is what you get in the set for the back at the link and shackle. I bought three sets because Ener. Sus. said, in the full set is enough for each end of the spring. It doesn't include the link bushing set, just the leaf eye's. Well, that doesn't do much good if all three aren't replaced at the same time.
You know what's in that tube, don't ya'. No, it's not that! It's that dang silicone that if you get it on you it's nearly impossible to get it off. I use M.E.K. to get it off.