...Here is another rare part recently acquired to complete my 901 gearbox, an OEM and NOS 901 ZF Coarse Spline https://pbase.com/9146gt/image/147721920 Limited Slip Differential https://pbase.com/9146gt/image/147721925. The very same part used by Porsche in their factory prepared 914-6 GT race cars. Part Number: 901.332.053.13 - 901 332 053 13 - 901-332-053-13 / Date 04/04/1991 https://pbase.com/9146gt/image/147721913