The eye bolt never touches on these particular sliders , a UHMW block rides in the channel on both sides with a steel sleeve that the spring bolt goes thru , all of witch are replaceable . How often they need replaced , I don`t know .
I was thinking seriously about these last year when I was going to go offroad only and think the universal ones here , http://www.liquidironindustries.com/product.php?productid=17611 would be easier to mount on the MJ .