Part numbers for the door latch bits on the B-pillar are:

123 720 01 04 - left door locking eye, $18 list 5 years ago
123 720 02 04 - right door locking eye

116 723 02 11 - plate (has the same footprint as locking eye), $1 5 list years ago

116 637 00 11 - plate (outboard of locking eye), $2 list 5 years ago

Looks like the latch in the door is one unit based on the EPC.

I'd try an impact wrench before heat.

Sixto
93 300SD