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just get the gs300 clear markers and then you have to shave the edges to make them fit its cost about $20 or your can buy the markers made for the sc300/400 made by vertex which is expensive something like $120 i don't remember
Buy some GS300 clear side markers (2nd Gen) from ebay. I believe they are about 20 bucks. You will have to do some shaving of them but once in place they look completely stock. I have them on mine and get compliments about them all the time.