thank you for clearing that up that was a really big part of figuring this out. when I move those bolts around they are pretty stiff compared to the old ones which are nice and smooth in regards to your question. As others have mentioned on various other posts on the subject you tear these front ends apart and just go, its old replace it all. Only to realize maybe i would be better off getting some new boots for the old ones. the car had alot of play in the steering from day one. I was told by the guy that aligned it after i did my engine swap I needed all new bushings so I figured go all the way. I did upper and lower control arm bushings which thank god are not this brand, all new tie rod ends, strut rod bushings and hellwig sway bar kit. My car was not equipped with one. In looking at alot of pictures of different brands there is some slight differences for instances if you look at the moog pictures the left and right for 73 and up are not the same the drivers side looks straighter I think I should get a more reputable brand that is factory correct. Which brings up the other thing which is are the ones on a given car original. LOL when you go to by these things you can look at whats one your car and go it looks the same. You can go by a fitment guide which isnt always right either. the proforged assemblies are different side to side these sets i have are the same side to side. in terms of shape only flare out opposite where the tie rods connect. the two sets I have in my possesion one set is from china and the other looks to be from napa which must have been done years ago. which have the same shape as well but a more flater machined mating surface on one set. there may not have been a difference from the factory but start looking them up to buy and look closely and there are differences between manufacturers. moog and pro-forged are machined flat both sides where the bolts go through they are a different shape side to side. I believe this is what a factory correct set should look like. i have two idler arms same deal they are a different shape and design both say they fit. Im going to the 73 service manual and look super close at the drawings. Cause I cant trust whats on my car to be right and you cant hardly trust the fitment guides.