[MBZ] Glow plug question for the experts

[Loren Faeth]

Bosch 0 250 201 001 is what fits in most of the diesels with  small pencil 
type glow plugs.  It has a 5 digit application number of 80006.  Bosch 0 
250 201 039 also carries the 80006 designation.  Can anyone tell me what is 
the difference, if any?

TIA
Loren
81 240D
86 and 87 SDLs
et al