Part number for heated o2

[ECMnut at aol.com]

In a message dated 11/3/00 6:53:49 PM Eastern Standard Time, 
xybertron at cox-internet.com writes:

> 
>  Early 90's Corvette ZR1's.  If you check at www.carparts.com it should 
> show
>  a Bosch 13077 and the AC Delco version is around $300 each.  2 needed in a
>  ZR1.
>  

Wow, that is a great deal more $ than the GM heated
 O2 sensor for the GMC Syclone.
How are they different?
TIA
MV
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