sandmans and gts had the same wipers as a normal holden of its model in the h series..the pics you have put up are of an aftermarket head...
ss and sl/r toranas wipers were the same as any other lh lx uc torana.there not speshal.
there is many different aftermarket heads that will clip on to a standard wiper arm and because of this there is lots of myths regarding fun things like lightweight and aerodynamic wipers etc....:Chin: