RK-88HL and DG-5HL are used on the old upright cylinder Poulans with Tillotson HL carbs.
RK-23HS/DG-5HS is used on the 360/361/400/401/450/451, 200/300 series (306/245/etc), and 4200-8500 CounterVibe saws.
K10-HDB/D10-HDB is used on the Walbro HDB's in 3400-4000 saws.
RB-31/GND-21 for the Poulan Pro 375/385/395 saws with the Zama C3A carburetors.
K10-WAT/D10-WAT is used on the XXV and Micro series tophandles with Walbro carbs.
RK-14HU/DG-2HU is used on the Tillotson HU carbs on the XX/20 saws and the XXV series saws with Tillotson HU carbs.
K20-WAT/D20-WAT is used on the Walbro carbs in the non-stratto WildThing type saws and 2500-3050/PP255-305 series saws.
K22-HDA/D22-HDA is used on the 3450/3750 and PP330/380 saws. These saws have HDA164 and HDA137 carbs.
K22-HDA/D22-HDA for the Poulan 2800-3300, 3500, 3600, and Poulan Pro 365 saws (and maybe a model or three that I'm forgetting) that used the Walbro HDA49-1 carb.
Posted by ECCENTRIC in another thread.
Updated 03/21/14.