Rear axle ratios, 5.375:1

[spriteguy@juno.com (Matthew P Johnson)]

I ran across an old differential carrier with 8-tooth pinion and 43-tooth
crown wheel (5.375:1).  This sounds like a ratio found in a Morris Van. 
Does anyone know if this will fit in a Sprite MkIV axle housing?

Any potential problems with using this in an autox car?

Thanks.
Matt