Here's a unicorn.  Arctic Cat muffler 0412-102. NOS from closed AGCO warehouse.  Box was incorrectly labeled with # 0512-405 which is the number of the muffler that replaces 0412-102. I have several vintage Arctic Cat parts from same source. This is the only NOS 0412-102 I can find and it's the only one I have.  Used and rusty ones are available, ads for NOS come up out of stock. See pics and verify your fitment. Free shipping in continental US, others at cost.  Ebay now handles international shipping which makes it easier. Ask any questions before buying. I have many NOS AGCO parts including Oilgear Hydura pumps, radiators/coolers, belts, filters, tines, decals, gearboxes, etc.  Willing to sell entire cache of parts to interested party.