The SIPCO STR-1-SM SAFE-TRAK-ST Safe-T-Rak Vehicle Seat Mount Hardhat Rack is easily installed on the back of most vehicle driver or passenger seats and adjusted to secure most hardhats even those with a full brim. The Safe-T-Rak is also available in a Suction Cup Window Mount Model (P/N: STR-2-WM) that easily secures onto glass surfaces. Sold individually.
See TnA Safety, Webster, NY on MacRae's Blue Book