Here is an older style briggs carb to tank gasket plus diaphragm
Briggs & Stratton Diaphragm and Carburetor Gasket Kit 3 - 5 HP 270026 & 272409 | eBay
Here is an newer style briggs carb to tank gasket plus diaphragm
Briggs & Stratton Diaphragm and Carburetor Gasket Kit 3 - 5 HP 272538 & 271928 | eBay
Here is a briggs and stratton diaphragm will work on old and newer style engines
Briggs & Stratton Carburetor Diaphragm 3-5 HP Horizontal Engine 272538, 272538S | eBay
Briggs & Stratton Diaphragm and Carburetor Gasket Kit 3 - 5 HP 270026 & 272409 | eBay
Here is an newer style briggs carb to tank gasket plus diaphragm
Briggs & Stratton Diaphragm and Carburetor Gasket Kit 3 - 5 HP 272538 & 271928 | eBay
Here is a briggs and stratton diaphragm will work on old and newer style engines
Briggs & Stratton Carburetor Diaphragm 3-5 HP Horizontal Engine 272538, 272538S | eBay