Long time since i checked back here,
In regards to your question i havn't used rockauto for bmw parts (an e30 too) but ive used pelican parts.
I think from memory the parts can be housed in different warehouses all over the usa and i was going to get more parts but they were in different warehouses and so the parts were going to ship in individual boxes to aus, pushing shipping way up. I ended up dropping a few things and just getting the stuff that was from the one place to save on shipping.
For anyone planning on doing a timing belt at home, and dont have access to like a $1000 air compressor with enough balls to get the crank bolt off, i would highly recommend getting one of the crank pulley holder tools that are on amazon. It cost me $26 from the states for the tool and then i got 2 breaker bars from supercheap (they actually didnt break i was amazed) and used this setup to get it off.
In the end my leak was indeed the waterpump, the seals had shit itself, but the pump itself seemed ok, it spun freely still.


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