Kit #1 is a single sense electrode (one wire that goes to the electrode, applicable to S/N above 920500001), Kit #2 is a dual sense electrode (two wires that go to the electrode, applicable to S/N below 920500001).
Tune-Up Kit #1 Contents: (links in blue)
Tune-Up Kit #2 Contents: (links in blue)
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Suburban Furnace NT34SP Exploded Parts View Links and Downloads
Item# 3 Bottom Duct Adapter Gasket
Item# 6 Duct Collar (link): 050715
*Not Shown* Duct Cover (link): 050733
Item# 7 Thermostat, White (link): 161154
Item# 7 Thermostat, Black (link): 161210
Item# 8 Harness (link): 520322
Item# 10 Electrode, Single Sense (link): 231933, Above S/N 920500001 (New P# 525029)
Item# 10 Electrode, Dual Sense (link): 230956, Below S/N 920500001 (New P# 525019)
Item# 12 Burner Access Door (link): 030764
Item# 13 Electrode / Burner Door Gasket Kit (link): 071076 (New P# 525011)
Item# 18 Electrode / Burner Door Gasket Kit (link): 071076 (New P# 525011)
Item# 21 Limit Switch (link): 230496
Item# 33 On / Off Switch (link): 232351
Item# 35 Module Board (Ignitor Board) (link): 521099
Item# 38 Module Board Insulator 070538
Item# 42 Vent Cap & Exhaust Tube Assembly (link): 260573
Item# 43 Intake Tube Assembly 050906
Item# 48 Burner Assembly 010701
Item# 49 Orifice 180222
Item# 50 Manifold Gasket 070408
Item# 53 Gas Valve 161123
Item# 60 Gas Fitting 170374 (New P# 525025)
Item# 61 Room Air Wheel (link): 350113
Item# 65 Sail Switch (link): 230509 (New P# 233356)
Item# 72 Crossover Tube Gasket (link): 070385
Item# 75 OEM Motor, 12VDC, (link): 231208
Item# 75 After-Market Motor, 12VDC, (link): 231208MC
Item# 76 Motor Gasket (link): 070384
Item# 77 Combustion Air Housing Assembly 390410BK NLA
Item# 79 Combustion Air Wheel (link): 350110
Item# 81 Combustion Air Housing Gasket (link): 070386
Item# 82 Combustion Air Housing Assembly (link): 390424