A week or so ago I contacted "Aussie Lockers" (www.aussielockers.com)to see if they could supply a unit for a friend's 1987 4 cylinder Gen 1 24 spline front diff. here's my question:

"I would like to know if you can supply a unit for a Mitsubishi Montero. It is for the front diff. I'm hoping you might as this vehicle is popular in Australia, it is called the Pajaro there. I need one for a 1987 model with a 2.6l 4 cylinder. The spline count is 24 on the shafts. I think it has a 7.5" ring gear dia."

Here's their reply:

"We have a front Montero locker we just brought into our stock in the USA. We have not yet completed the market information to enable us to add this to our product line so we are not sure if it is what you need or not. We will try to make this happen later this week and get back to you."

I'm pretty sure they are the US distributor for the "Lokka"
I haven't heard back yet, I'll follow up when I do.