Briggs and Stratton 2100 Series Engine E/S 1"x72.3mm
Distance between mounting hole centres (front to back) = 195mm
and left to right is 86mm. They are 9mm diameter holes.

Crankshaft centre is 106mm from the bottom of the base.
Using spacer kit 695154 raises this to 132mm.

The crankshaft extends to 87mm from the side face of the engine and approx 154mm from the L/H mounting hole centre.