Includes M4 replacement dial, stainless steel wire lace, lace lock and flat head screw driver for easy lace system replacement in the field. For use with Simms G3 Guide BOA Vibram and felt. To verify which Lace Length you need look inside the boot on the tongue label where the size is marked. Previous Guide Boa, Headwaters BOA and RiverTek BOA Boot in Vibram® and felt order M2 BOA Field Repair Kit. For 1st generation RiverTek BOA wading boots, order M3 BOA Field Repair Kit. For the G4 BOA Boot, order the G4 BOA Replacement Kit. To verify which RiverTek BOA Boot you have, look inside the boot on the tongue label where the size is marked. 2nd Generation boots will state BOA® M2 Reel and the lace length, 1st Generation boots state only BOA® and lace length.