70297 is almost 14 wide, 10.250 tall, and just over 3.5 thick
70298 is 10 wide, 10 tall, and right at 4 thick

Just a thought, but I have mounted them right off of the floor using windshield wiper motor rubber mounts with a nutsert. The wiper mounts will squeeze into the holes on the core and I use a 1/4 20 SS button head to thread into the nutsert.