The SIPCO STR-2-WM Safe-T-Rak Vehicle Rear Window Mount Hardhat Rack is easily installed with suction cups onto any glass surface to secure most hardhats. The Safe-T-Rak is also available in a Vehicle Seat Mount Model (P/N: STR-1-SM) that conveniently secures onto the back of most vehicle driver or passenger seats. Sold individually.
See TnA Safety, Webster, NY on MacRae's Blue Book