Temperature Blend Door Actuator which part number?

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stilllearning6

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Tahoe 2003 5.3 liter with Auxiliary rear heat controls located in the front overhead ceiling:
I am having difficulty identifying the correct replacement part for the Auxiliary Rear Temperature Blend Door Actuator.

Dealer said that the original part number #15201869 is no longer available, and that there have been 3 subsequent changes.
The latest change listed was PN was ACDelco 15832319 , discontinued.

Advanced Auto listed Motormite 604-100 as exact fit, $40.
Ordered it. Installed it.
My experience was incorrect PIN pattern: Failed .

Internet shows prices from $20 -$160 for exact fits.
What part is correct?
 

stilllearning6

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Ordered from Amazon / AA Ignition , Florida ( internet ) $31.99 incl s/h. Will post follow-up results.

Advertisement stated : replaces PN # 89018375
" AC Rear Blend Door Actuator".
 
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