hole locations - custom see below
Rail A - 7'6" (90") overall length (are you able to ship a rail this large or do I need to split it into two?), mounting holes at each end and also at 27" from the left edge and 59.5 inches from the left edge.
Rail B - 46-1/2" overall length. Mounting holes at each end and also at 24" from left side of rail
Rail C - 17" overall length. Mounting holes at each end