www.takakaira.com - Your source for hard to find Japanese parts. They have close to everything it seems, and service is good and fast. Example: I buy a S-AFC II. Within 24 hours I get an email asking me to confirm or delete the ordet with the shipping price they have found. Then my credit card is used to pay within a few minutes. There is also a spot there wich lists when they expect to have the part if it's not in stock. If it is, most stuff has come from Japan to Norway (that's around the world for ya) in a week. And even with that time, the Norwegian Postal Service took three of those days getting the package to me.
Recommended.
Impul header can be found at
www.japanparts.com also.