They are installed before the section is sealed up as part of the cars assembly.
You could cut a 1" ish hole w. a hole drill. Hold the nut and then get a rubber plug to seal it.
Bernie Bilski berniebilski@cox.net1995 Nissan 300ZX TwinTurbo in Cobalt Green1997 Nissan 240SX SE in Ultra RedZCCNV #390 ~ ECZA #368
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