Never heard of Huffy toilet seats...
I checked with some toilet mfrs, and neither have they. Best guess is, it's already been replaced at least once with an aftermarket seat. The good news is, most marine toilet seats are interchangeable brand to brand, so you should be able order a new one from any toilet mfr. Household seats will fit the larger "highboy" marine toilet bowls...if they won't fit yours, it means your toilet has the smaller "standard" size. However, repair parts for marine toilets are NOT interchangeable brand to brand, or even model to model from the same mfr...so you do need to know the make/model of your toilet...and I'd find out before replacing seat. 'Cuz depending on what make/model it is, and whether it's still the original toilet, it may not be worth spending the money for a new seat plus the rebuild it it's likely to need...it could even be obsolete. So you may be better off just replacing the whole toilet.
