V-Stretch drive shaft length for 50mm ext?

[o0wiz0o]

Hi folks. First post so go easy on me!

I've had a look around but I am struggling to find what size shaft I will need. I could mod and extend the current stock or if anyone knows compatible Cups and a dog bone I'll go that way.

Any help much appreciated.

Edit: Ok I bought some UE 6mm cups that apparently fit Maxx truck diffs....so just shafts now.