bought an lsd for my 318, was told it was an m3 diff that would fit straight in. wouldnt fit in so compaired sizes of both diffs, the caseing between where the prop bolts on - to the halfshafts was roughly an inch longer than the standard diff and the cups are also bigger. does anyone no what the lsd could be out of, or cud i swap the internals from the lsd to the standard diff.