Doing assembly on my freshly narrowed 9" and had a few questions (yes, I've searched). 1. Is the gasket between the brake backing plate and housing absolutely necessary? I have the inner axle seals installed. 2. I ordered the above mentioned gasket and it is a thin steel not a fiber gasket like I took off upon dissassembly. Is the steel gasket okay to run? 3. Do I really need black sealant on the chunk gasket? Both sides? One side? Thanks in advance.