I can't believe the LWB is different than the SWB for that long bolt. I was able to put mine in right side up. You just can't drop it straight down in the way the OEM one would go in. You have to go into the big space behind the light, then feed it up first into the smaller space and drop it down into the hole from there. Sort of a zig-zag thing.

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com