Product review (5 stars): This is OEM = Frigidaire 5309957099 = Surface burner infinite control switch for 8 inch burner
This fits - among others -
>>> 1964 Frigidaire Flair Custom Deluxe RCIB 645-2

> Surface burner INFINITE control SWITCH for 8 inch burner, 240 volts.
> That will be the left rear big 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.

>>> ALSO - speaking for ONLY FRIGIDAIRE RCIB 645-2 stoves =
This Frigidaire 5309957099 is also the correct switch for the RIGHT FRONT 8" burner =
IF THE ELEMENT (burner) HAS EVER BEEN CHANGED FROM THE ORIGINAL 'HEAT-MINDER' element
and NOW IS AN INFINITE HEAT 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

> This part - Frigidaire OEM Part # 5309957099 = fits - Frigidaire model RCIB-645-2
Searches on a couple main web sites for appliance parts shows many part #'s this 5309957099 replace

Replaces Part Number 5307534769
Replaces Part Number 09957099
Replaces Part Number 07534769
Replaces Part Number 07526396
Replaces Part Number 07525722
Replaces Part Number 07525721
Replaces Part Number 07522792
Replaces Part Number 07521370
Replaces Part Number 07521245
Replaces Part Number 07521243 >>> this is the # that was on original switch - just replaced for L.R. burner.
Replaces Part Number 07520196
Replaces Part Number 06591447
Replaces Part Number 06590463
Replaces Part Number 06564355
Replaces Part Number 06564312
Replaces Part Number 06563695
Replaces Part Number 06563645
Replaces Part Number 06562429
Replaces Part Number T6539547

Replaces 2525
Replaces 6539547
Replaces 6563695
Replaces 6590463
Replaces 66004-9AF
Replaces 7521243
Replaces 7521245,
Replaces 7521370
Replaces 7522792
Replaces 7525721
Replaces 7525722
Replaces 7526396
Replaces 7534769
Replaces 9950919
Replaces 9957099
Replaces AH474739
Replaces EA474739
Replaces N9950919
Replaces PS474739
ReplacesT6539547.

One of two switches recently replaced.