Grass 02902-15 TEC Hinge, Side Mount, 1-1/2 Overlay, Dowel, 42mm Boring Pattern

I need to replace some existing Grass hinges that have failed. Grass suggested contacting you to purchase. They suggested 02901-15 as the closest approximation to the obsolete model; however, I am fairly certain that my existing doors are drilled on 42 mm. Further, I am confused about the difference between the screw-on and dowel formats. It seems all Grass hinges have screws to affix the cup to the doors. My existing doors have at each cup location two rigid plastic offset anchors into which the screws holding the recessed part are driven. Are those doweled, then, or screw-on? Thanks, in advance, for your help. Jim