Need Floor Pan Drain Plug Measurement

I'm hoping somebody can help me out. I have a Pontiac Fiero that had a sunroof problem that led to a floor pan problem. GM helpfully discontinued making the floor pan plugs, but I noticed that the fox body Mustang has a similar style plug. What I haven't been able to find out is if they are even close to the same size. Can somebody measure the size of the Mustang floor plug?

My oval is about 4 x 3.125. I have included a few pictures, because who doesn't like pictures?

Thanks!
Dave
 

Attachments

  • IMG_20180812_173019567.jpg
    IMG_20180812_173019567.jpg
    279.3 KB · Views: 186
  • IMG_20180812_173043665.jpg
    IMG_20180812_173043665.jpg
    271.2 KB · Views: 164
  • 2015-04-27 14.11.14.jpg
    2015-04-27 14.11.14.jpg
    269.2 KB · Views: 175
  • Sponsors (?)