I found this seaching for something else and saved it on my computer. I would love to give credit to the author of this but I cant remember members name. Again Im sorry for not knowing the name of author.
I have put this up before but it has been a while so here it is again:
SERIES MODEL
1106 090
1107 07
1108 08 S
1109 090 G
1110 041
1111 051, 075, 076
1112 041 G
1113 030, 031, 032
1114 020
1115 045, 056
1116 015
1117 042, 048
1118 028
1119 038
1120 009, 010, 011, 012
1121 024, 026, MS 260
1122 064, 066, MS 650, MS 660
1123 021, 023, 025, MS 210, MS 250
1124 084, 088, MS 880
1125 034, 036, MS 360
1127 029, 039, MS 290, MS 310, MS 390
1128 044, 046, MS 440, MS 460
1129 020 T, MS 200 T
1130 017, 018, MS 170, MS 180
1132 019 T, MS 191T
1133 MS 270, MS 280
1135 MS 361
1137 MS 192
1138 MS 441
1139 MS 171, MS 181, MS 211
1140 MS 311, MS 362, MS 391
1141 MS 261, MS 271, MS 291
Every Stihl model is part of a series that gets assigned a series number when it goes into the R & D phase and if it makes it to production. Any parts unique to that series will have the first four numbers of the part number as the series number.
So look on the bottom of the tank housing and you will see an 11 digit number. If it starts with 1125 then the saw is a 034, 036. If it starts with 1127 it is a 029 039. And so on.
Some parts will carry over from one saw to another, and the number on the part may not be the actual part number of the replacement part, so don't try to order a part without looking it up on a current IPL.
So let us know what saw you have, MM.
opcorn: 
