You might want to check Singapore hobbies. They have had an extensive inventory of Hatori pipes and headers and the exchange rate is pretty favorable.
I would be surprised if HAtori is still manufacturing any 60 size pipes or headers as the demand is pretty low. Mueller headers are first rate and only about $45 (US) plus shipping.
Macs muffled pipes will work with any 60, but if you can get a Hatori pipe I'd jump on it
-Will