20" replaceable sprocket nose guide bar.

3/8" pitch, .063" gauge, 72 drive links

Replaces: 

• GBSN 20-63PA
• Oregon Ref. 203RNDD025
• Silver Streak R3632072-4025SS

Fits: Stihl 026, 026 PRO, 026P, 028, 028 Super, 029, 030, 031, 032, 034, 034 SUPER, 036, 036 PRO, 036 QS, 036P, 038, 038 Super MAGNUM, 039, 039 SUPER MAGNUM, 040, 041, 042, 044, 044 MAGNUM, 044M, 045, 046, 046 MAGNUM, 046M, 048, 056, 056 SUPER, 056S, 064, 066, 066 MAGNUM, 088, 088 MAGNUM, E15, E20, E220, E220Q, MS260, MS260 Pro, MS 61, MS261C-M, MS261C-MQ, MS261CQ, MS270, MS270C, MS270C-B, MS270CQS, MS290, MS291, MS291C-BEQ, MS310, MS311, MS341, MS360, MS360C, MS360 Pro, MS360QS, MS361, MS361C-B, MS361QS, MS390, MS440, MS440 MAGNUM, MS441, MS441 ARCTIC, MS441C, MS441C-M, MS441C-MQ, MS441RC-M, MS460, MS460 MAGNUM, MS461, MS650, MS660, MS660 MAGNUM, MS661C-M, MS661RC-M, MS880, MS880 MAGNUM, MSE200, MSE220, MSE220Q, MSE250C