I order them according to the value written on the side of each capacitor and i get them from altronics
http://www.altronics.com.au/ each cap has its own voltage and micro farad rating ie 10V 100uF so its important to put the same one in as you removed,once they are out its fairly easy just pop in the new cap and solder it in,caps have a positive and negative pole and the circuit board has the negative side marked on it so make sure you put them in the right way round.
good luck and if your not keen doing it yourself im happy to do it just post the ecu to me and ill put the new caps in and send it back.
cheers,
pete