I talked to Richmond Gear who make Lock Right Lockers about making a locker for the Rocky and variants. They said for people who are interested to write. And if there is enough interest they would consider it. I know here in the US there are just not enough units about 12K and I don't know how many are still on the road. And out of that how many would want lockers.
I know that from researching diffs for my own just purchased Rocky, the options are non existent if you want to keep your original units. I have seen quite a bit of interest posted here and on the UK Daihatsu site for locker/posi options.
They said to write to eval(unescape('%64%6f%63%75%6d%65%6e%74%2e%77%72%69%74%65%28%27%3c%61%20%68%72%65%66%3d%22%6d%61%69%6c%74%6f%3a%73%61%6c%65%73%40%72%69%63%68%6d%6f%6e%64%67%65%61%72%2e%63%6f%6d%22%3e%73%61%6c%65%73%40%72%69%63%68%6d%6f%6e%64%67%65%61%72%2e%63%6f%6d%3c%2f%61%3e%27%29%3b')) and let them know your model and year.
For my own knowledge does anyone know if the carriers are the same same front and back? In the dirt, off paved road Lock Rights can be used in the front. They unlock when the load is removed. They can be used on road on snow...... if only one wheel is locked in.
Anyone interested can find info at Richmond Gear under Lock Right. They are very big here in the US, I have them in my 75 Jeep Grand Cherokee Chief "S" and they are awesome. Way easier a than an Air Locker and just fine for me. Some mention the clicking sound around corners which is normal, doesn't bother me.