These are pre-cut holes, that you must weld into your existing firewall. Could also be glued in with professional grade sealant. This kit includes everything for the firewall, does not include A/C blower, at the top of the rain tray.
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Seen below is the full MK1 engine bay plug kit. This kit consists of everything to weld in the front cross member, inner fenders on both sides & the firewall.