Hi ... I found the ratio I was looking for in a 735iM but the differential measures 1.5 inches longer than mine ... the technicans said it wont fit!! does anyone really knows about it? I wasn't able to get the right ratio to replace the 3.91 I have on my car. if it doesn't fit does anyone knows about the Japanese imported cars and which ones has less ratio on 5 series from 520 to 540i anything between 3.46 to 3.64 ... thanks