Product review (5 stars): This is an OEM part = Frigidaire 5309957098.= Surface burner infinite control switch for 6 inch burner
This is a long trail - but the end result is this DOES FIT - among others -
>>> 1964 Frigidaire Flair Custom Deluxe  RCIB 645-2
> Surface burner INFINITE control switch for 6 inch burner, 240 volts.
> That will be the right rear small burner on RCIB 645-2 = infinite heat =
which is simply a regular switch = which allows heat from low to high and everywhere in between,
hence the name infinite.

>>> (An infinite heat switch DIFFERS from "Low - Med - High switches, which provides only three heat settings)
> Typically when a switch malfunctions, the surface element (burner) will not heat,
or will remain on high in every position.
>>> Matching = 6" element = Frigidaire 5306590804

>>> ALSO - speaking for ONLY FRIGIDAIRE RCIB 645-2 stoves =
This Frigidaire 5309957098 is also the correct switch for the left front 6" burner =
IF THE ELEMENT (burner) HAS EVER BEEN CHANGED FROM THE ORIGINAL 'SPEED HEAT' element
and NOW IS AN INFINITE HEAT ELEMENT.

> This part - Frigidaire OEM Part #5309957098 = fits - Frigidaire model RCIB-645-2
(which is same as first number replaced - now different by starting with 53 -)
Searches on a couple main web sites for appliance parts shows many part #'s this 5309957098 replaces.

Replaces Part Number 09957098
Replaces Part Number 07533010
Replaces Part Number 07532999
Replaces Part Number 07531878
Replaces Part Number 07531877
Replaces Part Number 07531379
Replaces Part Number 07526395
Replaces Part Number 07525720
Replaces Part Number 07521242
Replaces Part Number 06563642
Replaces part # 614
Replaces part # 7521242
Replaces part # 7525720
Replaces part # 7526395
Replaces part # 7531379
Replaces part # 7532999
Replaces part # 7533010
Replaces part # 9950918
Replaces part # 9957098
Replaces part # AH474738
Replaces part # EA474738
Replaces part # GR5600
Replaces part # N9950918 >>> this is the # on the switch just replaced on our stove = works perfectly
Replaces part # PS474738
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Footnote - 8" ELEMENT SWITCH & ELEMENT = we had a lucky find on ebay
>>> Frigidaire 5309957099 switch is correct for the left rear 8" burner which has always been infinite heat.
And = if the ORIGINAL RIGHT FRONT 'HEAT MINDER' element has ever been converted to a regular
element OR (as in our case) CUT THE WIRE OFF HEAT MINDER BUTTON
and change switch to infinite heat switch. (because burner still works)
>>> Matching 8" element = Frigidaire 5306590805

One of two switches recently replaced.