Does it have a 4 pin connector?
If it does, it is the brake warning lamp check relay. The 4 pin connector will have blue, black green and green w/yellow stripe wires going to it. The relay senses when your brake fluid level is low. Oh, btw... the seat belt warning timer unit is located in the relay block under the dash on the passenger side wall.
Now, for your rust problem...
Check the links section and in the parts and accessories. You will find dealers with replacement floor pans.bbbbb
If it does, it is the brake warning lamp check relay. The 4 pin connector will have blue, black green and green w/yellow stripe wires going to it. The relay senses when your brake fluid level is low. Oh, btw... the seat belt warning timer unit is located in the relay block under the dash on the passenger side wall.
Now, for your rust problem...
Check the links section and in the parts and accessories. You will find dealers with replacement floor pans.bbbbb