If you go to SuperCrap they have a rack with different length earth straps in black, they are extremely good quality with about a 1/4" core, I'm pretty sure they will let you take a few out to see which ones fit length wise, 2 should suffice.......Battery to intake, intake to strut tower.
You'll pay through the ass if you buy a dedicated kit.

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Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.