there are two clusters, and gear sets , 2nd and 3rd ratios change between 4 cyl and 6 cly
but you can swap them in sets , just fitted a spitty box with vitesse cluster and gear sets
not much sinlge rail fits 3 rail lots of bits very close but needs careful part number checking, or you get
more reverse teeth or a right wobbly 1/2 hub ,
and 3 syn vs 4 sync is another not much mix and match