The stock y on a regular cab is the same as on an etended cab correct.. thanks Much

 

Just ran outside at work and looked at a '04 Reg Cab & '04 Ext Cab in the parking lot. From looking at them they appear to be the same. I would have tried to measure them to make sure but I didn't have anything to measure with.

 

they are the same, the only differences is between the 2wd and 4wd (front driveshaft clearances)