I recently contacted Lokka about making an auto locker for our C200k rear axles. The powertrax has pretty poor user reviews, the ARB is a grand, and the m226 swap generally necessitates an expensive regear.

I have had great experiences with my front lokka, the install was easy thanks to the write up on thenewx and I've kept pace with trucks that are built way out of my league.

RJ, the representative who answered my request, said that
"They've told me they would prefer to get have an order of 50 units but will consider an order of 30 units.*

To do this the factory will also require a donor diff to design the new Lokka to fit.*
The diff carrier,internal gears, cross pin and the inner piece of axle would be required.*

"We are willing to do an exchange of Lokka for the diff if you can find a donor willing to exchange."

The list starts here and it is combined between thenewx and clubfrontier 
Lets see what we can get going!

PRICE is set at $340 USD

1. FRONTIER4X
2. Mtaylor
3. Blue Fronty 
4. Eroc101
5. GMK14
6. LittleBull
7. Sabertooth
8. Slick72
9. DiscoCam
10. Sanders
11. Grelliot
12. Random Person
13. SwanSmash
14. Multifidus
15. CCG1018
16. Battousaited
17.
18.
19.
20. 
NEXT 30 SIGNUPS WILL GET THIS PROJECT ROLLING

Wish I could help. Both my Nissans have the M226. Seeing your experiences with the front Lokka has me seriously considering it for the front of my X.

Thanks John, the front option works pretty well on the hills

Added a lot more signups

Post if youre interested