Integrated dishwasher too tight a fit

My current integrated dishwasher is 59.5cm and it only just fits in the gap. All the new dishwashers I have looked at seem to be between 59.8 and 60cm so I don't think they will fit. Is it possible for me to fit a slimline 45cm dishwasher with the larger door? I realise there would be gaps either side of the dishwasher but you wouldn't see them as the door fits the full gap. Would the gaps be a problem or would the dishwasher stay in place ok?