ETL7045E is the standard for the 5 speed GM box and STC4862 is the part number, so any recognised brand meeting this specification is fine.
Genuine oil is available online for £13.50 per litre (I found on ebay from a parts company).
Febi Bilstein make a compatible oil also, 32600.
Mannol Dexron VI also lists meeting the standard. This is the only one on the list except the genuine one I found which specifically states it meets the ETL7045E standard. The others specifically say the Dexron standards.
Opie are also correct with the Fuchs recommendation, here's the specified oils from Fuchs for that gearbox, 4000 or 5500:
In terms of Fuchs as a brand, I use their high performance stuff in the 5.0L Jaguar with no issue. 2015 Range Rover Autobiography 4.4 SDV8
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