To fit E28, E30, E32, E34 and E36 including M3 3.0L mid-sized diffs with 8 bolt cover. All LSDs are custom builds or aftermarket. Standard LSDs are only available as part of a complete diff build. I don't sell standard rebuilt LSDs on their own. The base model custom LSD is a 1.5-way 25% / 40% unit with custom ramps (ceramic ground, heat treated, blasted, relieved) which retain the floating differential section. These have no free-play or noise, which is common in almost every other custom unit. These are the most advanced custom LSDs available anywhere in the world. Aftermarket solutions from Diff Lab include MFactory and Cusco. Pricing on MFactory is exceptional and most units are on the shelf. Lead time is only a few days is MFactory is out of stock. I also stock rebuild kits, and gear sets. I build complete differentials to order on an exchange basis.