According to the tyre size you quoted for the space saver you already have the correct one, so it would be pointless looking for another space saver. The alternative would be to buy a secondhand 16" alloy wheel and fit the same tyre as already fitted to your Jazz, at least then you would not be restricted to a maximum speed of 50mph as applies to your space saver.
Honda themselves acknowledge that the space saver (compact spare tyre) is smaller than your standard wheels, quote from my Honda Jazz handbook:-
"The compact spare tyre is smaller than the regular tyre. Your vehicle's ground clearance
reduces when the compact spare tyre is installed. Driving over road debris or bumps could
possibly damage the underside of your vehicle."Used sensibly there should not be any problem using it but I personally would only fit one to replace a rear tyre, so if the puncture was in a front tyre I would move the rear tyre to the front and put the space saver on the rear of the car.
I have only used a space saver once before and as an 'emergency' tyre it enabled me to drive to a tyre depot and have the punctured tyre repaired and refitted to the car and distance travelled was only about ten miles.
It is interesting to note that if you took your car fitted with a space saver in for an MOT it would fail its MOT as the space saver is classed as an 'emergency' wheel only.
Here are a few links to some websites that have info relating to space savers:-
http://www.theaa.com/motoring_advice/safety/non-standard-spare-wheels.htmlhttp://ktgreen.co.uk/blog/?p=33The second link is advice on fitting a space saver to a Subaru WRX Sti, in the text they mention that the space saver should only be fitted to the rear although in the video demonstration they are shown replacing the front wheel. Think the reason for this is that the car in the showroom had its front wheel on a nice bit of carpet and it was easier on their knees!
