thanks for the replies. I know where the GPs are I was just saying that I worked in a tight area of the car such as the door panels before and I was comparing that tight area to the tight area in which the glowplugs are located. Sorry for the confusion. I'm in washington, DC and the car is a 1983 300sd I thought that was in my profile thanks.

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W126 1983 300SD 286,000 miles and ticking
Baby blue exterior Grey MB tex
Recent work:
Replaced air cleaner mounting brackets and heat shields
Replaced alternator, fan and power steering belts
Replaced positive battery terminal
Replaced negative battery terminal and cord
New Duralast Battery

My car needs work.