a vk lsd or non-turbo vl lsd should fit a pintara 25sp diff a turbo/v8 lsd from a vl/vk should fit a skyline 28sp diff later commodore live axle lsd (vn-vs non irs) should fit a skyline 28sp diff
please check out specific examples for yourself but in general this is true
Sorry I can't help with the colour code, but you definitely have the right idea keeping the standard colour. My car is a non-standard colour and that's the biggest thing I dislike about it!
When I have the time/money/care I will return it to the standard colour.
By the way, this is a fantastic looking little wagon. Don't take any shortcuts on the bodywork - repair all the rust properly and make it into a 'keeper' as there aren't many of these things around in this condition.