I'm looking for either the stock orange air cleaner that came on the '72 Z or some aftermarket air cleaners that will work well with the SU's

There are a couple options

This item is pretty usual on ebay. There is one on there now-

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7919044696&category=43946&sspagename=WDVW

Only downside to that one is the sellers rating is only 81%.

Ztherapy sells them as totally reconditioned -

http://www.ztherapy.com/

There are several aftermarket air cleaners available. You might try -

http://www.zcarparts.com/

http://www.victoriabritish.com/

Hopefully this info will at least get you started. Others may be able to provide more options.

Morning,

Saw your request, I happen to have two of them, one orange the other red. Will sell for $75.00 plus freight. I am located in SW Florida so freight should be very little. Let me know at Multiplex1@AOL.com.

Take care and "Enjoy the ride!"

DJ