Well, I received an order,from my customer, who is looking to restore his 1974 Pontiac LeMans.police unit. He was looking etal trunnion for a radio "tree" that his dept. had run in the 70's, and could not find one. I checked on the shelves and came up with a radio rack,designed to fit the radiohead,a siren and an sw 70 switchbox, like the one I restored for the customer. It was made by ACME and it was available in both black and chrome. the design was pretty simple, and it was copied by many public works departments back in the day. the design by ACME included as many brackets as you wanted and after so many, it was highly recommended that you purchase a stabilizer bar,or two, depending on what you were going to do. The good people at ACME, offered extras that would attach to their rack, like a handheld spotlight cradle, and a predrilled long bar, which was used to mount the heavy Motorola metal speakers. The diagram that they used,was very well done,and even showed equipment being mounted horizontally, like a giant tinker toy setup, and it says, if you wanted to add equipment, you had the option of running sideways. You could tell that the design people for this item went insane and just added radios, and switchboxes and assorted hoo-ha in the picture , just to sell this .Mounting this was a separate adventure, and was not for the faint of heart.With the hardware they included, FOUR lag bolts which were long enough to secure garage rafters,it was recommended that the installer drill through the rubber mat and or carpeting,and the metal trunnion.and with the lag bolts being what they were, you'd drill into the transfer case of the transmission.NO GOOD. we got around that by using a scrap piece of 1/2 inch pine board, BETWEEN the metal floor and the rubber mat, this way the rack would be secured at its base. the next project was to position the board exactly on the hump and pulling and fighting with the rubber mat to get this done. after 3 hours of incanting the phrase JESUS, MARY AND JOSEPH, the board would be ready to accept the mount. The fun of building police cars!!. here are some pictures of the rack as it is. :hopeless: