I used seperate spade terminals for each connection. This allowed me to keep the original wiring in place. You can buy the headlamp connectors, but i would go for new versus a junky, you want nice new uncorroded terminals.
I assume you have seen the stuff online to rewire the headlamps using relays.
Do you really have H3 highs? Not H1 ?
I used 10 gauge from the relay to the highs, remember from the high relay (unless you use 2 high relays) to lamps the wire carries current for 2 filaments per side, anywhere from 10 to 17 amps depending on the bulbs you are using.
With relays and heavier wiring, it makes a noticeable difference.
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744-16v-4+OD 185kmi., 745-16v-4+OD 359kmi., 242Turbo-4+OD 170kmi?, 245DLT automatic 287kmi.. 245SE automatic 198Kmi.