Thanks guys for your info.
Digger - thanks for the link which i have researched in the past but that mod does not suit the VLSD nor does it use CVs
Richard & Mydato - I do have MR30 rear lower from IRS which was in the last models which are the same as the DR30, DR31 & 280ZX.
All that is required is use the Companion flange from the MR,DR 30 31 whatever and have it resplined to fit into the Subi CV stub axles (this is the clip in design) so i am told.
Looking at the rear lower arms from the 1600 and the others they look the same but maybe it is a different story when measurements and bushes are compared, at this stage I dont know.
I thought there may be someone out there who has done this mod before which should be less expensive than alternatives and use CVs instead of universals. From a performance point of view the CVs are superior.
Thanks again guys for you feedback.