FE original muffler I’d details

[JohnBM]

Q: is there on the market a replacement muffler that suits the original standard FE grey motor ?  Obviously I have a muffler on my car now that does the job , but just wondering what others are using.single tail pipe, oval shaped , full bore , reverse flow type muffler . Is in the workshop manual . Is there a identification number relevant to the said muffler that the industry uses:   Cheers  John .