Brown part numbers changed a lot on these stations, not so much on the bushings but on the arms, blocks, shafts, ect.
Consult your parts manual first.

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508x00580  3.5 half bushing    BSG1009
508x02110  3.0 x 3.37 x 1.5 lg     BSG1012
508x02120  2.5 x 2.87 x 1.93 lg   BSG1013
508x02130  3.0 3.38 x 4.0 lg   BSG1014
508x02140  2.5 x 2.87 x 2.99 lg   BSG1015
508x02170  2.5 x 2.87 x .99 lg    BSG1040
508x02560  3.0 x 3.38 x 5.62 lg   BSG1175
508x03330  2.5 x 2.88 x 1.5 lg   BSG1029

508x02101 BSG1026 will not interchange with 508x02100

Arms will differ depending on machine size

Long stroke - MC4500 & MC5500
498x18330 short arm (7" centers)
498x18320 long arm (13.5" centers)

Short stroke - MC4000 & MC5000
498x13800 short arm (5.5" centers)
498x20390 long arm (10" centers)

Note that bushings begin with 508
         manufactured parts with 498