The Model USD kit is for Square D 150 and 200 Amp panels that have a large head mounting screw located under the main breaker as shown. The panel should have approx. 1 3/8" spacing from the bottom edge of the main breaker cover knockout to the top edge of the gen breaker cover knockout.
 
The generator breaker will occupy the two top right breaker positions.
 
All GenSafety Generator Interlock Kits are proudly made in the USA and include everything necessary to complete the interlock install including the interlock assembly, all hardware, thread lock compound, a full decal set, a correct size drill bit, and clear instructions.
 
Thank you for your business and thank you for buying USA!