The starter relay MUST have an isolated coil (same as the GP relay). A relay is nothing more than an electrically controlled switch. The small terminals control the switch and the large terminals are the switch.
In the unit linked the black wire would terminate on one small terminal and purple/white wire would terminate on the other small terminal. The red supply wire would terminate on one large terminal and the purple load wire to the starter soleniod would terminate on the other large terminal.
It does not matter which terminal you use for each control wire so long as you are using the small terminals for the control wires only. It does not matter which terminal you use for each power wire so long as you are using the large terminals for the supply and load wires only.
In other words you cannot use the small terminals for power and you cannot use the large terminals for control.
Whether or not the unit linked would work is strictly a matter of it having an isolated coil.
If you were take a multimeter and read continuity between either small terminal and the case it would be a case grounded coil unit (NOT an isolated coil unit) and it would NOT work for a starter (or GP) relay.
Perhaps this seller will verify that it is an isolated coil relay before you purchase.
Too slow

darn it.