If its not "hot" buy it. $500 is a great deal for condition discribed. I don't recall the price for glow plug(s) but when I was browsing for a water pump online, I recall the plugs being very reasonable. You can get them from this site's sponsor Fastlane or other MB parts outlets. Search for an "Arizona Parts Warehouse" or "Adsit" for price comparison.

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Mike

82 240D 97K Original (Sweet)
96 Ford F350 CrewCab Dually,7.3 PowerStroke,144K
(a real workhorse, does anything I need)
04 VW Jetta GLS TDI, 33K (50 mpg & it's quick)
Notice a trend? All diesels

63 Chevy II Nova Convertible (wife's) awaiting restoration - Well everyboby has a little gas every once in awhile