Which MC pinion spacer for mk3 diff?

[kotu100]

Out of the 2 options on the site which do I need? The short one or the long one?
http://www.marlincrawler.com/differential/parts/solid-pinion-spacer-kit

 

[Bogwon]

on the site it specifies that the long one is for a 4 cylinder and the short one is for a 6 cylinder... not sure that helps.

 

[toyotanos]

Weir performance makes the spacer for our diff. MC focuses mostly on Hilux truck stuff.