These are ready to install! This has also been WELDED for top notch reliability and durability. These are +4mm stroke, +5mm long rod (115mm). NO CRANKCASE MODIFICATION is needed to install this crank. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Engine Parts\Other Engine Parts".The seller is "minkia38" and is located in this country: US. This item can be shipped worldwide.