Found this exc. pdf
http://www.peachparts.com/shopforum/attachments/diesel-discussion/129114d1430754844-sanden-retrofit-installation-guide-w123-61x-sanden-ac-compressor-conversion-part-i-ver01-00.pdf

by forum member Mahone Bay on Rollguys Sanden kit which has nice step by step instructions with pics on R4 removal.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked