My son wants to install retractable 2 point or 3 point seatbelts in his 56 post. I have found a couple pics but no real meat to how to get this done in a good manner. The motivation for the retractables is to not be seen very much. We plan on belts in the front and back so any suggestions would be appreciated. We would also like to match the original green interior as we are going to remove it and fix everything needed and put it right back in. In too good of shape not to. Thanks in advance for any help.