The Saturn Astra had several power steering schemes, with two main steering racks ZF and TRW; the former was generally used for "higher performance" versions (BUT not all XR models had the ZF).

TRW used round fluid tanks (ZF fluid tanks were roundish with 2 flats). These are wired differently too.

The inner tie rods differ on the systems, I think.

***Some rack part numbers.
93179548 - Without quick-ratio. Astra. Without non variable steering.
93189018 - With quick-ratio. Astra. With non variable steering.

***Some pump part numbers
93179568 - Without quick-ratio.
93196804 - With quick-ratio. (replaces 93181657, 93181659, 93196064)
https://parts.folsomchevy.com/oem-pa...-gear-93189018

Check part numbers with your Chevy dealer using VIN numbers to confirm fitment.

***SOME RPO CODES
NR1 STEERING POWER, NON-VARIABLE RATIO, ELECTRIC HYDRAULIC REDUCED RACK TR
NS1 STEERING POWER, NON-VARIABLE RATIO, ELECTRIC HYDRAULIC REDUCED RACK TR
NS2 STEERING POWER, NON-VARIABLE RATIO, ELECTRIC HYDRAULIC

***THEORY OF OPERATION
https://charm.li/Saturn/2008/Astra%2...on%20%28ZF%29/

https://charm.li/Saturn/2008/Astra%2...n%20%28TRW%29/

***REPLACEMENT STEPS
https://charm.li/Saturn/2008/Astra%2...nt%20%28ZF%29/

https://charm.li/Saturn/2008/Astra%2...1%2C%20NS2%29/

 

https://charm.li/

 

I don’t see any problem here.

 

There is some irony around these responses.

I'll just sign off.