This kit contains (2) laser-cut 1/4" mild steel plates that bolt to the left and right side of the OM60x,/OM613/OM648 engine block, plus 12 bolts/washers. They were designed using an NA 606. Material is pickled and oiled A36, which welds very nicely. You weld your own material onto these 2 plates to create your own motor mounts. These are said to work with the M104, as well.
 
 
These will definitely fit OM602, OM603, OM604, OM605, OM606, OM613, OM648. I have not tested them on other OM or M series blocks, yet.