had the fronts on my tracker for about a year before changing the lift, they are the umhv plastic or whatever it's called, solid parts just like jeff's spacers.
had the rears on my tracker also for about the same amount of time, i added them to keep the rear up when i had the tracker full of gear. they could be used on the front also but would just need the centre bored out a bit.
$20 a set + shipping.
