gbs100a sander parts availability

Sector experience since
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Joinery installation in the broadest sense
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Hi, I have a burnt out field on my bosch sander model number 2 610 908 605, however when I looked for a new part it is now discontinued  (0 601 276 942 (Field)) however it would seem that there are as many field part numbers as there are model numbers and some of them are available ... would anyone know if they are they at all interchangeable?  And if they are different why did bosch change so much within the gbs100a 'family'.  There are dozens of different part numbers for fields for this model.  Seems a shame to throw away a good machine for one part.