Outer Limits 4x4 Board

Looking for a cheap Auto Locker for my 40 series.
Anyone got any tips??
Thus far i have come to 1 conclusion, import one from the US. found Detroit lockers for 240 US. so 360 Aus dollars.
anyone got tips or views before i start buying something that could be useless??

a welding stick, a metal plate and a few hours

http://www.outerlimits4x4.com/PHP_Modul ... ht=detriot

Detriot is allready installed so there is another cost you`d save.
You`d end up with your centre as a spare centre.