When you replace the mechanical fuel pump with Type 1 engines by an electrical fuel pump, you should block off the opening of the engine case, where the mechanical fuel pump has been mounted before. For this purpose Vintage Speed has made a stylish block off plate made from polished stainless steel, that BBT can deliver from stock. This block off plate is delivered with the 2 hex bolts inclusive. The seals are available separately under item number # 1690-90.