Different vehicles require specific repair solutions. For passenger cars and SUVs, a standard 4-inch string plug kit is sufficient. However, for heavy-duty trucks or OTR (Off-The-Road) vehicles, you must source kits with extra-long reinforced plugs and high-torque reamers. If you are catering to high-end service centers, prioritize 'mushroom plug' patch kits, which require a wire-pull guide and provide a permanent internal seal that is safer for high-speed driving compared to external string plugs.