Can I fit a astra AH Manuel transmission into my astra ts sri 2001 . They look identical I found a new one but it for an ah on the advert. If it will fit I want it because my trans is going to go soon insure. It runs fine but when I pulled it today the seals were leaking and it only had 400mls of oil in it when I drained it. God only knows why it’s running fine I filtered the oil and found no metal filings but the red oil was almost black???????