This Bel Products Inc Model N121005 Weatherproof Steel Door Enclosure (12 x 10 x 5 inches) would be perfect to protect antenna relays, lightning arrestors, preamps or other electronics outside, either at your tower or at the coax entry to your shack. 

Comes with 9 3/4 x 11 inch removable electronics metal mounting plate and has 4 mounting holes on flanges on the back of the enclosure.  Made from heavy steel and weighs about 14 lbs.  About half the price of a new one. 

https://www.produitsbel.com/en/product/industrial/single-door-enclosures/s-series

Plus shipping cost  

Mike VE6TC nrossairdrie@shaw.ca