Leak at rear of oil pan, could it be the girdle?

Yes sir it is. 440 source girdle, Milodon windage tray and pan.
6 years I fought an oil leak. Every week I would have a small puddle on the trailer floor. I swore it was the rear main. With the engine painted black and the gold pan I couldn't find the leak. Then I thought it was coming from the top and change the valve cover and gaskets and covers. Made a billet timing cover. Installed a evac system thinking it was crank case pressure.

The oil was all over in the bell housing and under the car.
After we tore the engine out to freshen it was sitting on an engine stand and got a puddle under it. I figured left over oil coming off the outside of the engine.

After cleaning the oil up on the floor. one week later there was another small puddle. Come to find there was a pin hole in the pan . You could not locate where the oil was coming from due to the gold pan and the gloss black engine.

I will never paint an engine black again and will always paint the gold pans. Now every new Milodon pan gets filled with Diesel and let them sit. Found another one after that on a customers engine new out of the box. Just something to always check. Who would think a new pan would have a pin hole. Both were Milodon.