Oil pan bolt size?

Does anyone know the size of the bolts that hold the oil pan together on the bottom? I know the head size is 12mm so I guess I need the length size? I have an oil leak there and I was tightening the bolts a bunch were loose and saw that one is missing. I think it’s the oil pan(be easy on me this is my first 4Runner lol). The bolts from the running boards I took off same 4runner look like they might fit also 12mm head(it’s the bolt in the pic with nut on it) thank you. Pics included

 

I take one to Home Despot or Lowes and match it in their Metric fastener drawer.

Otherwise, the dealer can get exactly the bolt if you take one in.