Fits for: Universal 43cc 47cc 49c 2-Stroke Engine. Parameter: Side Opening: 15mm, bolt Hole Spacing: 30mm. High-quality: Exact equivalent part meets the original manufacturer??s specifications and features, 100% suitable replacement for your old or broken one. Secure Installation: It takes you few minutes only to put it on your engine, watch a video on YouTube is gonna help. A year’s warranty: For any reason you’re not completely satisfied, you can ask for a replacement or full refund.