Kit #1 has a single sense electrode (one wire to the electrode, applicable to S/N above 920500001, Kit #2 has a dual sense electrode (two wires to the electrode, applicable to S/N below 920500001).
Tune-Up Kit #1 Contents (links in blue)
IN-STOCK
Tune-Up Kit #2 Contents (links in blue):
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SUBURBAN FURNACE NT-24S EXPLODED PARTS VIEW LINKS
Item# 3 Bottom Duct Adapter Gasket (link): 062164
Item# 6 4 Inch Duct Collar (link): 050715
*Not Shown* 4 Inch Flexible Heater Duct Hose (link): E4-25
*Not Shown* 4 Inch Duct Cover (link): 050733
Item# 7 Thermostat, White, (link): 161154
Item# 7 Thermostat, Black, (link): 161210
Item# 8 Harness, outside, (link): 520322
*Not Shown* Harness, Inside, (link): 520323
Item# 10 Electrode (link): 231933 (Above Serial Number 920500001)
Item#10 Electrode (link): 230956 (Below Serial Number 920500001)
*Not Shown* Ignition Lead, 40 Inch, (link): 232456
Item# 13 Electrode Gasket: 070163 NLA (Use New P# Link: 525011)
Item# 18 Burner Gasket (link): 070398 (New P# 525011)
Item#'s 13 & 18 Electrode / Burner Door Gasket Kit (link): 071076 (New P# 525011)
Item# 21 Limit Switch (link): 230496
Item# 35 OEM Ignition Board (link): 521099
Item# 35 After-Market Ignition Module Board (link): 521099MC
Item# 35 Dinosaur Electronics Ignition Module Board (link): FAN50PP
Item# 38 Module Board Insulator 070538 (not needed when using new version of ignition boards)
*Not Shown* Time Delay Relay (link): 48000
Item# 42 Vent Cap & Exhaust Tube Assembly (link): 260573
Item# 43 Intake Tube Assembly (link): 050906
Item# 48 Burner Assembly (link): 010701
Item# 49 Orifice 180215 NLA
Item# 50 Manifold Gasket (link): 070408
Item# 52 Manifold Pipe (link): 171468
Item# 53 Gas Valve (link): 161123
Item# 53 Gas Valve (link): 161123-OS
Item# 61 Room Air Wheel (link): 350113
Item# 65 Sail Switch (link): 230510
Item# 72 Crossover Tube Gasket (link): 070385
Item# 75 OEM Blower Motor, 12VDC (link): 231206
Item# 75 After-Market Blower Motor, 12VDC (link): 231206MC NLA
Item# 76 Motor Gasket (link): 070384
Item# 79 Combustion Air Wheel (link): 350110
Item# 81 Combustion Air Housing Gasket (link): 070386
*Not Shown* Fan Switch (link): 230575