m80glostick

hello. so i just connected my new hatch to my 240 because the old one had that rust sponge of a spoiler on it and well...... rotted out the old one. now ive noticed that the wiring on the "new" hatch is all cracked and needs new wiring and that the ruber grommets are ripped. i was wondering 1. where can i find more grommets? and 2. what size wire i should use to rewire the ground(driver side) and the power(passenger side).

p.s. the driver side ground is shared with the ground for your antenna. so the rear defroster and antenna are spliced into the same connector.

also attaching hatch to car mechanically is about a 2-3 person job because the freaking thing weighs about 40 lbs. and the angle for getting those bolts back in are a pain in the ***.