Here is a photo of one for sale on Ebay. Although it's rear sump, I don't think it will fit the F1 Ford truck. The 49-50 merc oil pan looks much different in the bell housing area.
https://www.ebay.com/i/153518468825?chn=ps
Merc oil pan looks like this.
https://www.ebay.com/itm/142469044271