anyone recognize these merc megaphones

[53w]

I got these 3 megaphones at a swap meet had old tag on them said Mercury BP. They are stainless under the paint. One of them was repaired at one time. From other Pictures of complete BP engines I seen they don't look to be factory pipes, no springs, elbows different? They do look to have correct mounting flange to mount up to mercury plates?

I Don't know anything about them, just wondering if anyone may recognize them or who built them?




53w