Where can I get the iron ones from?Get a new one and in my opinion, go for the iron one, not aluminium. If you replace the fluid regularly then they don't gum up as much
Do a web search for Smithies landrover and download the parts manuals in pdf form.NZ website.
I have a 1971 swb 2a....so I think from what you are saying. These 109 cylinders are no good for my truck?as long as the rears are 10" brakes the rear 109 cylinders should fit the rear of any series from '86 wheelbase onwards iirc.
series rears won't fit series fronts