St. Charles Isuzu has always been able to get my OEM parts, they ship for free, and the price is 10 or 15% below list price. Other dealerships vary in the price they'll quote you.
Also, I'd be surprised if they couldn't sell you just the tabs, or maybe a kit of some sort. Make sure you talk to Merlin if you don't like the answer you get elsewhere (even from another parts counter tech at St. Charles). In my experience he has always come through even when others told me a part was unavailable.
Calmini Cone Air Filter, PowerVault PV2 Muffler, OME Trooper Springs, Rancho RS9000X Shocks, 285/75R16 Nitto Grappler AT's, Pioneer DEH P8000R In-Dash CD, Amps and Drivers Built by Orion, Wires and Fuse Blocks by KnuKonceptz, Vibration Damping by BQuiet, Alarm System featuring Auto Start and Remote Windows, Yakima LoadWarrior w/Full Size Spare, Debadged/Custom Titanium Grill Logo, Tint (5% Rear / 20% Front), Steel Braided Brake Lines, G2 Painted Calipers