Need Floor Pan Drain Plug Measurement

Aug 12, 2018
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Loudoun County VA
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
 

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