Not sure about the 335d, but the 335i had 2 types of differential housings since 2007 (a larger on and a smaller one) and Quaife have created 2 models that can work within each. I guess you need to clarify what model number you are looking at (I think they are either 10N or 13N, if I am not mistaken) and then determine if it is a valid option for your d. Harold@HPA or Mike@VAC can probably help with this.
It looks like a great deal for a great product, I hope you can make it work!
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