Dolphin tech offers individual plate and harness backpack combos.
Depending on your need, there are 4 models to choose: JTA-1. JTS-1, JTA-2, JTS-2

•  Back plate is press-formed with bent, anatomical lower corners
•  Adjustable nylon webbing harness straps with hook and loop hose tie downs
•  Harness includes 4 D-ring attachment points: 2 at the waist, 2 at the shoulders
•  Adjustable crotch strap with D-rings at front and rear.

Options: 

• Basic: Aluminum back plate (BP-4) with Basic webbing harness (HB-1) and Crotch strap (HB-3).
• Deluxe: Aluminum back plate (BP-4) with Deluxe webbing harness (HB-2) and Crotch strap (HB-3).