Re: car seat holster
Country, I'm not sure of anyone making one specifically for this purpose, but I rigged one using a ballistic nylon holster from a shop in Lakeland, Florida. I bought it at a gun show for cheap - as I figured all it had to do was hold the gun, not look pretty. It had a velcro thumb strap and a extra mag holder - this was for a full size 1911.
What I did was put the gun in it, sit in the truck seat, and hold it under there as if I was drawing it. Held in this fashion, I had a friend get under there and temporary it in place with some zip ties through the belt loop on the holster. Once hanging about right, I added more ties to keep it from flopping around. Worked fine. It was essentially tied to the seat springs in about 6 places.
Insure you have the seat where you want it, and check for clearance if you move your seat a good bit, like to get in a back door or something. Don't forget about other "doodads" mounted under there like radio gear and such - all can snag the gun if the seat is slid around.