Got some off the bay of thieves a few years backYou after these ones http://www.ebay.com/itm/1993-2001-JEEP-CHEROKEE-WRANGLER-15-Wheel-center-cap-52057618-Silver-OEM-USED-/191466196817?pt=Motors_Car_Truck_Parts_Accessories&hash=item2c94464f51&vxp=mtr
Not needed, but damn funny if you put a few small stones inside someone elses so they rattle at low speed.
Thanks for the replies chaps. I'll ACF50 the exposed parts and then slather them in waterproof grease! Like the small stones trick, cruel, but funny..