[Dujon]

It won't be an M205 as they are 20mm x 5mm (approx). I just ran my callipers over a couple and they are usually a little more than 5mm diameter - around the 5.25mm mark. Not that it matters in this case.

Sorry, Chris, I've checked my stock of fuses - I've still a few hundred banging around in a box - but no 2AGs or similar.

Keep in mind you might need to know whether the replacement should be a fast or slow blow. Slow blows are often used in devices that have a heavy transient current requirement (e.g. at turn on) and will not fail until the fuse rating is exceeded for a few seconds; often for considerably more than a few seconds!

You also have to ask why the original fuse blew to start with - unless you already know. The lesson here being that if you only buy one replacement you could be in trouble if there is a fault somewhere else in the equipment.

I also recommend WES as mentioned by centauri. While I don't use them often these days they used to have a fantastic range of components. They are in Ashfield, Sydney (Liverpool Rd, which is the start of the Hume Highway).