Need Help! Trans Crossmember nut broke in the body

[seangfy]

I'm in the middle of doing an auto to 5 speed swap and I was bolting the front transmission crossmember in place and the internal nut on the body side snapped loose so no i can't bolt tighten down the bolt. Its bolt number 1 on the picture below. i looked on the inside of the car to see if i could get to it under the carpet but i could not find it. Any advise would be help full thanks in advance

(if this would be better to post in the body section can a mod move was not sure where the best place to post this)

[Someperson]

You are going to need to have the nut re-welded/ have a new nut welded in... My 3+4 are stripped

[seangfy]

Is there any way to get to it from inside the car I pulled the carpet back and some of the sound deadening and could not find any access to it

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[Legacy777]

A hole has to be cut in the chassis to get access to the bolt so it can be rewelded on, and then the piece of metal that was cut out to access the nut should be welded back on.