wheel cylinder rebuild question

I looked up the cost of wheel cylinders on Rock Auto and this is what I found. For the cost of new ones, I wouldn't mess with rebuilding your old ones.




CENTRIC Part # 13463016 Premium Wheel Cylinder
Front Left; 9" Drums; w/Front Drum brakes; w/Rear Drum brakes

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* Stocked in outlying warehouse--shipping delayed up to 1 business day
$14.17
CENTRIC Part # 13463017 Premium Wheel Cylinder
Front Right; 9" Drums; w/Front Drum brakes; w/Rear Drum brakes

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* Stocked in outlying warehouse--shipping delayed up to 1 business day
$14.17
RAYBESTOS Part # WC37103 Professional Grade; 1" Bore
Front Left; 9" Brakes

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$18.00
RAYBESTOS Part # WC37102 Professional Grade
Fr