218494 McCulloch Replaceable Sprocket Tip 16" Bar .325 pitch .050 ga, 68 Drive Links Vintage NOS.  We have these in Back with Yellow letters and Gray with Black letters. 

Also McCulloch 223195 / 218923

Numbers on bar are 218494 1650 5630 EL 

*Make sure your spur or rim sprocket match the pitch of your bar sprocket tip.  Both must be .325" pitch*

The D176 mount fits the following:

• Echo:  CS-60, CS-60S, CS-451, CS-452, CS-500, CS-501EVL, CS-510EVL, CS-550, CS-590, CS-600P, CS-601, CS-602, CST-610, CS-610T, CS-650, CS-660, CS-670, CS-680, CS-701, CS-702, CS-706, CS-750, CS-6700, CS-8000
• Fairmount Hydraulic:  H6200B
• JOHN DEERE:  50AV, 50V, 51SV, 55EV, 55V, 55SV, 60V, 65, 65EV, 65SV, 66SV, 70V, 80EV, 800V
• McCulloch:  1-10, 2-10, 3-10, 4-10, 5-10, 6-10, 7-10, 10-10, 10-10A, 55
• McCulloch:  PRO MAC 55, 60, 555, 560, 570, 605, 610, 620, 650, 655, 700, 800, 850, 1000
• McCulloch:  CP55, CP70, CP70L
• McCulloch:  DOUBLE EAGLE 50, 80
• McCulloch:  EAGER BEAVER 3.7
• McCulloch:  PM 605
• McCulloch:  PROMAC 5700, 8200
• McCulloch:  SILVER EAGLE 3420, 3720
• McCulloch:  SP60, SP70, SP80, SP81
• McCulloch:  TIMBER BEAR (earlier models)
• McCulloch:  TITAN 50, 57, 70
• POULAN / POULAN PRO:  203, 245, 306, 306A, 360, 361, 375, 385, 395, 400, 446, 450, 3400, 3700, 3800, 3900, 4000, 4200, 4400, 4900, 5200, 5400, 5500, 6700
• RED MAX:  G621AVS
• SEARS / CRAFTSMAN:  35212, 35483, 35487, 35608, 35609, 35690, 35721, 35727, 35728, 35826, 35829, 35851, 35881, 35885 ELECTRICS (1983 MODELS AND FORWARD), 35887, 35889
• SKIL:  1641
• TANAKA:  ECS-505, ECS-506, ECS-650, ECS-655