Hi, I'm Ken of hobbyncrafts. I've been making custom CF landing gear for over 5 years now. Have made them for 12 oz. electrics to 21 lb. gassers. Let me know the dimensions you need, and I'll see if I have one in stock. If not, I certainly make one ! Need to know the width at fuse, and at base...elevation from axle to fuse, and the weight of the Extra 300. I have satisfied customers coast to coast and in Canada. You will find my prices VERY fair. As soon as I hear back, I can work up a quote if it is something new...or give you a price if I have one here.
Ken
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