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I have replaced them on my EV a couple of times, and as far as I can tell the Norge is identical. Commonly, you have a 7/8" bar, and on the right a throttle tube on top of the 7/8", which is about 1". So when you buy grips, you get a 1" for the throttle and one for 7/8" tube on the left.With the heaters, they put a tube on the left side also, so both sides are 1". What I have done is buy two sets of grips, and throw away the two lefts. Put a 1" throttle grip on the right and left.I just replaced the EV ones with a set of foam ATV grips that stretched to 1". I suspect they will split easily because they are stretched tight.The heater is an aluminum foil glued to the plastic tube. You can carefully cut and pull away the old rubber grip. If the foil is coming loose, tape it back in place with some thin tape. I then 'lube' the new grip with a lot of grip glue (hair spray) and slip it on. When the spray dries, you are good to go.
Gotta buy a new pair of grips for the '07 Norge I got a couple weeks back. They'll have to hold up to the heated base and bee durable overall. Any recommendations? Also, just curious, what is the Norge bar size at the grip?