Hi flakey, They look like repro's to me,originals have more fins,have a look at attached photo's top heat exchanger original Right hand side original.left repro! Hope that helps.
The originals have far more surface area inside and out which obviously helps with the heat dissipation
Cheers, the outer cases are like net curtains, the collars are non existent so they rattle like funk! Not worth the trouble of repairing if they're repro's.
Check the weight. I recently moved mine around in the garage, picked up a genuine one put it to one side, picked up what I thought was a genuine one and nearly chucked it out the window it was so light
