Found your first two part #s at: http://www.drivewire.com/vehicle/1991-g ... trip-seal/
Found 10130386 at: http://www.buygmpartsworldwide.com/part ... eid=215130
10130387 shows discontinued with only references to salvage yards. Hope this helps you.
2001 CC LS, pewter, stock, 4.3,Wait4meperformance, CFM throttle blade, Helix throttle body spacer, 4spd auto, 3button electric 4x4 shift, heavy duty factory suspension, Bilsteins, 1" rear wheel spacers, skid plates.