kevco oil pan rear seal fit trouble

Rear rubber seal to oil pan doesn't fit well. Can I SUCCESSFULLY use ultra grey gasket maker in place of the rubber oil seal piece?

Measuring the kevko pan proves to be:
1. 1/8" shorter from flat area to deepest point.
2. 1/8" shorter in opening width of rear seal opening.
3. 5/16" shorter in the circumferential section of rear pan.

Im not "canning the pan" as everthing else seems impressive.

The fit when trying to use the rubber rear seal will obviously bend my new pan.

Measurements taken were comparison of factory to the kevko pan.

What's up fabo will the silicone work?

Thanks for the ongoing assistance. Looking forward to DRIVING the car.