Precision Compatibility: This Throttle Lock Trigger Spring Kit is designed to replace for Husqvarna 353 359 357XP 350 345 340 346XP,ensuring optimal performance and compatibility. Precise fit for OEM numbers: 503854401, 503854501, 503998601.OEM Compatibility: Our Throttle Lock Trigger Spring Kit replace OEM numbers for 503854401, 503854501, 503998601 for precise replacements, making it easy to find the right parts for your needs.Complete Set Included: Our Throttle Lock Trigger Spring Kit comes with essential components: 1 x Throttle Trigger, 1 x Throttle Lock, 1 x Throttle Spring for a comprehensive solution.Superior Quality Assurance: Crafted from high-quality materials, this Throttle Lock Trigger Spring Kit guarantees a long-lasting service life. Please compare your original model carefully with our product details to avoid any mismatches.Professiona Repair Kit: Engineered for arborists and landscaping professionals,the Throttle Lock Trigger Spring Kit breathes new life for your equipment.