How to fill the rear end

Hello, so i am rebuilding my s14 and I am going for the v2 boss kit,,

100mm flare on rear and 50 on the front so the issue is whats the best way to fill the space? Spacers arms ?

I am gettin 18 by 10 rear with 15 offset but i know they wont push out enough is there custom arms i can get or what ?

New to this type of mods so any help would be awesome im looking to replace the control arms and stuff anyway as they are rusty as hell.

Lower offset wheels or spacers are more or less the only way. You can get adjustable lower arms but they tend to be more trouble than they’re worth.

18 x 10 et 15 is super weak for such a wide body! You might want to consider 12j’s with a negative offset to fill that space with massive 315mm tyres

A quick google shows the original RB car had 17 x 9 and 17 x 10 but big spacers.