OT -need help inentifying Sandvik tool

This is a little off topic, but since we are
doing machine work here, I was hoping someone
could help me out.

I am the proud owner of a Sandvik, T-maX, Coromant
lathe indexible turning tool holder.

The stamping on the side says
TAPR-12M bR175.2-1919M

I am having a dickens of a time finding inserts for
this holder.

It is a triangle insert holder, slightly smaller
than a TPG-322 and too large for a TPE-731

I'm assuming it is designed for a metric
insert as none of my inserts fit and
MSC and J&L don't offer inserts for Sandvik
tooling.

Dave