Eight newsreels vary on essential parts of vehicles (8,6)

I believe the answer is:

steering wheels

I'm a little stuck... Click here to teach me more about this clue!

'essential parts of vehicles' is the definition.
I know nothing about this answer so I can't judge whether this works.

'eight newsreels vary' is the wordplay.
'vary' indicates anagramming the letters.
'eight'+'newsreels'='eightnewsreels'
'eightnewsreels' anagrammed gives 'STEERING-WHEELS'.

'on' is the link.

Can you help me to learn more?

(Another definition for steering wheels that I've seen is " As aids for driving".)

I've seen this clue in the Sydney Morning Herald.

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