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ok so i went to tire rack and selected my car, then went to the suspension parts page. when i got to the koni yellows there were two choices for the front struts, ones for cars with 53.8mm outer diameter front struts, and one for 50.5mm. anybody know which ones i need? '01 EX coupe.

 
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Its been stickeyed in All The Suspension Info You Need!! Please Read!!! It reads "You've got 2 sizes for koni yellows. 50mm and 55 mm. There is no way of determining which you need by year. You MUST measure the housings of the struts in your car and buy the right ones. Honda mixed them in randomly and there is no other way to tell which ones you need." by robbclark1

 
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From what I know from when I was running a group-buy years ago on koni yellows, a 2001 requires the smaller size, 50MM. somewhere in 2003 they began using the 55MM but I would check myself if I were you.
Worst case scenario is you get the smaller ones and drill the hole bigger!