Reaching plugs with Hedman headers

Having issue accessing my rear two spark plugs on the driver side to tighten them (5 and 7. I installed headers for the first time, slipped the plugs in and I can’t get a socket in there. It’s 13/16. I don’t think I could even get a wrench in there. Do I need to back the headers out and hope I can make it work, or is there a tool? Or do I need to basically fab up a tool? I don’t have a welder but can have someone come up with something if needed.

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