Scotts/Sabre Engine Mount Bolt Size?

[V@rmint]

I have a Scotts 1642 mower with a 17hp Kohler. All 4 engine mounting bolts, apparently, have vibrated out and the engine is loose on he frame. (either that or someone never finished stealing the motor )
Without a bolt to use as a guide, I have no idea what size/thread they might be. Can anyone tell me?

 

[bertsmobile1]

If they are not through bolts then they are special self tappers unique to lawnmowers.
Otherwise 3/8 UNC

 

[StarTech]

Being a JD built mower and Kohler engine they will be metric.

Screw
Part Number 19M7798
Description
SCREW, FLANGED, METRIC
Remarks
M8 X 40, (ENGINE MOUNTING) Also can a M8 x 35

Washer
Part Number 24H1887
Description
WASHER, METALLIC, ROUND HOLE
Remarks
11/32" X 1" X 0.134", (ENGINE MOUNTING)

 

[Fish]

Go back with a smaller diameter one, that is longer, and use a locknut.