You might try talking to Detorres Detectors*
2008 11th Avenue
Yuma AZ 85364
Mon - Fri 10 am to 6 pm
Sat 10 am to 4 pm
Call 928-782-2480
I spend the winters in yuma and they are pretty helpfull , gave me lots of advice ,maybe i will run into you later this year , 107" is still too hot for me now , be back in late october