Unable to remove Burner assembly from Rheem 50gal gas WH.

[RM2881]

Any advice on how to remove this burner assembly would be appreciated!
I believe my thermal coupler is out I’ve already disconnected the lines but I believe the gasket is not allowing me to remove the burner assembly? I have attached pictures, thanks in advance for any suggestions.

 

[RM2881]

Update….
The gasket was stuck hard, I was finally able to break it free.

 

[TomFOhio]

That gasket is ruined you will need a new one. If its under warranty and not a 2004 model then you can get one from
them. Might have to anyway no matter what.

 

[breplum]

The thermocouple kit has both the round gasket And the bigger one.
Get the kit at plumbing wholesalers when you have the kit assembly number from the mfr's parts diagram or customer phone support from Rheem.