I've been doing research on finding the Honda muffler
online, but am a bit confused by having too many options.

Every site I go to shows two options for this muffler,
showing either the old or new numbers or a mixture of the
two:

18030-SV1-A30 -- replaced by 18030-SV1-505

18030-SV4-A30 -- replaced by 18030-SV4-405

But there's no indication how I tell which one I need. One
possibililty is that the SV1 numbers are for US-made Hondas,
and the SV4 are for Japanese-made Hondas. But even if
that's true, I can't tell if the parts are in fact
different.

Then just to be contrary, hondaautomotiveparts.com uses part
numbers 4878277 and 4878371. :-)

Can someone shed light on this please?


If it matters, the car is:

1994 Honda Accord LX 4-dr sedan, 49-state em., AT

It has the single exhaust pipe.