Can somebody check my math???

I am using an electric motor. The motor mount is "X" shaped. I use stand-offs between the motor mount and the firewall to get the prop the correct distance away from the firewall.

The short distance between motor mount holes is 1-7/8" (47mm)
I want the base of the prop to be 4" (101mm) from the firewall.
I want 2 degrees of right thrust.

If my math is correct. I need to shift the engine a little more then 1/8" to the right (but less than 3/16"). I also need to add 3/16" of extra standoff to the left mount.

Is this correct??? I'm not sure about if I got the extra stand-off amount correct.


TIA

Lyndon