I replaced my rear air shocks with new Monroe Air -Max units and I broke the
air line plug fitting inside one of the old GM shocks. Is there a line kit repair for this
or do I need to buy a new air line kit? In the mean time I pulled the fuse on the pump.
The new shocks are a much improved ride.

I believe you will need to buy the kit. Unless you can find something that may work at a hardware store or NAPA.