FM Radio Antenna Extension Cable?

[91burb2500]

Trying to get my FM tuner working properly on my 91. The antenna base was busted, but I was able to extract the stud and install a new one with a new GM antenna. Problem is the other end is not connected and the original cable that ran through the firewall is cut off at the grommet. What type of connector did GM use? It’s a female coaxial but is smaller than the usual one on the back of most radios. What is it called so I can try and get a new extension cable to make the connection?

 

[91burb2500]

I found that the coaxial cable for an 88-94 OBS truck works for this, part number 15573236. It connects right into the antenna end and the radio end, which was an adapter to the normal larger coaxial that aftermarket radios have. It was long enough to reach all the way to the radio without having to route it weird.