When you add the limited slip unit, you are replacing the carrier. Lots of them in salvage yards with your ger ratios. The housings do not change because of the ratio, only the ring gear offset of the carrier or L.S. unit. Get them as a unit and you're golden.
From what I understand the pinion is in a different location for the lower gearing. this makes the carrier for higher ratios not useable in my housing.