Hello from Dan. kb7uxe. I am talking with a company to make replacement meters for the SB220 and SB221 amplifiers. the old ones get sticky etc and are failing. the meter may not look exactly the same, but, the goal is to get a direct replacement meter. That is, no drilling, no added parts. a meter of the same electrical value and same mounting and generally the same size. simple easy drop in replacement. So, having said that, does anyone have the measurements of the: bolt holes, mounting hole diameter, mounted depth, and over all face size of the meter ? all my equipment is packed away in storage while our new home is being built.... Thank you for your help. ( extra points for images with the specs ). Thank you very much. Dan kb7uxe my call at gmail works too. Thank you .