Can glow plug system be updated in 1979 300D?

Hi,
Can the glow plug system be updated in 1979 300D to the early 80's version where one does not have to wait 40 seconds to start the car? I am assuming that the 80's 300D engines are exactly the same as the '79
one, are they?
TIA
cp
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What's the rush?
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:-)
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Beru makes a retrofit relay kit (w/ 4, not 5 glow plugs) that might suit your request.
http://www.beru.com/english/produkte/gluehkerzen/nachruest.php
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Will try, thanks!
cp
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