VRC- 43 Antenna Matching Network
" ... but do have original connector for power and four holes in top for mount "
I don't remember everything about the sheet metal mounting bracket, but I believe that the actual antenna mounted on the top of an antenna matching network that had two connectors on its bottom. One connector was RF to and from the radio, the other was a control cable that switched different matching networks depending on radio tuning. There was probably just a clearance hole in the body for the cables to pass through.