Refer man,

Yes it is strange. The 134 TXV has been available for some time. I suppose if you are buying a direct replacement, you are getting an R12 unit. If you were to click on Parts Shop above and contact Phil, I'm sure he could clarify this for you.

I know that I am "preaching to the choir" about 134 conversion, but in converting most MB's you run into more problems than possible leaks. As you know, you lose about 15% of your cooling capacity when going to 134 with no other changes. Most of the MB a/c systems of the seventies and eighties, and even into the mid nineties on some models, there is just no extra margin of cooling capacity as many other cars have.

Since you have plenty of R12 I think that fixing your existing TXV and recharging with R12 will give you the most satisfactory system.

Good luck,