I am installing a full oem clutch + flywheel and rear main seal. but I wasn't able to source the alignment tool, any suggestions on what to use? thanks in advance.

 

I picked up a Schley Products #68350 Honda S2000 Clutch Alignment Tool when I did my alignment. It’s made of heat treated Chrome-Moly Steel. It worked great. Admittedly, it’s overkill since a plastic one of the same shape would work fine. But if you want something that can also be used in an emergency to break windshields I highly recommend it.

 

One does wonder why you need a tool to break a window in an emergency --- with a convertible.