a long metal bar/thing on the back suspension one end connects to the floor near the petrol tank and the other end connects to the hub looks kinda like an old leaf spring,whatever it is,the passenger side one on mine is buckled slightly only noticed it yesterday hopefully thats the cause of my crap handling.Anyone know what it is called so i know what im looking to order?

 

That is the rear trailing arm. They are handed so be sure to describe it right.

As to getting one call David on Welcome to the API website

simple to replace. Just two big bolts.