See post 28. There is a picture of a Harbor Freight tie rod tool and a measurement to modify the tool so it can be used on a upper control arm boot. However, since your boot is already damaged it may work without the mod.

http://www.peachparts.com/shopforum/diesel-discussion/323469-lower-ball-joint-separator-w123.html

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84 300D, 82 Volvo 244Gl Diesel