If you are referring to the passengers side of the engine I think an obstruction spanner is the only answer, a flexi drive even if you could find one that fits would not impart sufficient feel for you to be sure the nuts are as tight as they need to be.
On the exhaust side of the engine as long as your 3/8 drive socket is under 20mm diameter it should fit, use a 3/8 drive extension as a 1/2 to 3/8 will not fit between the pushrod tubes, I would never use a flexi drive for this type of work.
Geoff.
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