Hot Rods ? Y-block C2C space motormount bolts

?What is center to center size of two bolt mounts were they bolt to frame?;I've got one bolt Y mounts that I'm using right now,but this is a hotrod and would like to also drill the mount plates for two bolts to frame just in case I ever need to replace them. 2bolt are more EZ to find in a pinch . Thanks if anyone knows the spacing on frame side/not block side.

 

Found out,=2,5/8in. c2c,one bolt dead center. if anyone also needs to know.