Here is a schematic for a simple, wide range balanced to balanced tuner:
simulate this circuit – Schematic created using CircuitLab
It consists of a 32 $\mu$H variable inductor (which you already have) and two double gang 470 pF capacitors. The voltage and current ratings will depend on the power levels you wish to run and the range of impedances the tuner will experience.
If you wish to feed this with a coaxial connection, you can simply put a good current balun with the appropriate transformation ratio on the input of the tuner.
If you are missing any of the parts to build a tuner, swapfests still are a good source. You may also have some success buying parts as replacement parts from some of the commercial tuner manufacturers. MFJ, for example, has their variable capacitors and rotary inductors available for purchase. They published them on their website and in their catalog.