Power Supply capacitor physical size

Hi folks, Looking at the PSU of my Lisa's ProFile after it died gracefully not so long back and it obviously needs new caps since one of the 1000uF 16V ones has bulged badly. While I'm replacing that one I'll do the 47uF 250V ones too. And the mains filters but I've got a stock of spares for them already. Apologies for what's probably a dumb question, but when it comes to cap replacement I know I can go up a notch if the required capacitance or voltage isn't available so 25V and 400V is ok, but what about physical size? I can get the correct capacitance/voltage but they're physically much smaller than the ones I'm replacing, like 10mm instead of 16mm diameter. If I go up to 25V I can get 16mm diameter which is the size of the old ones. Am I worrying for nothing? Cheers, from a room not filled with RIFA smoke for once :) -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?