I thought I posted this, but it disappeared. Unfortunately, the measured and "advertised" sizes often don't match. "Type M 5.5x2.1mm" barrel connector seems to be the most common answer for what you order. The plug on the Linksys power supply connector is actually 5mm OD, 2.2 ID measured. I've got both 10 mm and 11 mm lengths. The hole on the WRT is about 6 mm, but there's a spring loaded contact that has quite a bunch of give to it. The Belkin UPS we use a lot of is 5.5 mm OD, 2.2 ID on the connector, 12 mm long. They fit all the WRT54G* machines. You'll probably have to just get a part and try it to find out what "standard" it is. Or wait for someone who's already ordered the part somewhere.
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