Have a look to the impedance of the current speakers and choose the equivalent impedance for the GK speakers. The wiring of those replacement speakers should be easy then, just replace the speakers and connect them similar to the previous ones.
If the impedance of the replacement speakers differs you can calculate the resulting impedance (assuming it's a mono box
1. 4 speakers serial: R = 4*R
2. 4 speakers parallel: R = R/4
3. 2 speakers serial parallel to the other 2 serial speakers: R = R