Just changed mine out tonight on our 2010 Wildwood. They were white plastic but I changed them to the Mobile Outfitters grey polymer bushings. They are supposed to be self lubricating but I used lots of spray silicone on the parts when reinstalling them. The bolts were rusty some, cleaned them with sand paper and steelwool. Some of the bushings that I removed were not in good shape. Caught it just in time.
2004 F150 4.6 Griffin tuned
2010 Wildwood 24FBS