when i did my fronts, i check with the stealership. they have it
the bottom one is a slip on while the upper looks like an circular assembly made up of rubber.. all of them are special order from my neck of the wood.
i did no bother asking prices coz mine was still good (7 years)
2005 Nissan Armada, LE Silver 4X2, 18' custom wheels, Hankook ATM, Volant Gen2 CAI with Air scoop,AiRaid TBspacer, Bilstein 5100 fronts and Rancho 9000xl rears, Gibson Catback exhaust, SuperChips FLashPaq, Tranny OIL cooler MOD, Throttle MOD, Morimoto HID retrofit Kits, R-1concepts Premium slotted/cross drilled fronts. Chrome FenderTrims