http://purplecranium.com/
AlekG had originally contacted them to make us a differential cover guard (I'll let him recall the details of that once he becomes a member). After a short development time, PC came out with a spider that fits both the larger axle found in the EXT and the 8" found in the SWBs: http://purplecranium.com/i-88751-envoy- ... guard.html
I got around to installing mine a month or so ago:

While I did that, I changed out the gear oil for some 75W80 Royal Purple gear oil. It makes for good peace of mind knowing the differential is properly protected, and properly lubed...

