A while back I had asked about the process for sight glass replacements and got a variety of answers. I did some further research and found genuine sight glasses online cheap so I ordered 3 for my ST1100. Install went well and I now have a spare (bought in case I screwed up on one.) Each one is just 99 cents mailed from banggood.com - takes about 3 weeks to arrive.
http://www.banggood.com/18mm-Sight-Mirror-Gasket-For-Brake-Master-Cylinder-Reservoir-Motorcycle-Dirt-Bike-p-1045746.html?currency=USD?p=WJ13154638464201605A
Here's the old and the new (and the old one was the "good one" on my bike!)
http://www.banggood.com/18mm-Sight-Mirror-Gasket-For-Brake-Master-Cylinder-Reservoir-Motorcycle-Dirt-Bike-p-1045746.html?currency=USD?p=WJ13154638464201605A
Here's the old and the new (and the old one was the "good one" on my bike!)
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