I have both L98 and LT5 so this is interesting
The L98 Power steering Pulley rides on outside of belt (smooth side) and rotates counter clockwise looking from front.
The LT5 Power steering Pulley rides on inside of belt (grooved side) and rotates clockwise looking from front.
Did not measure diameter of pulleys since they are not interchangeable.
The oil reservoirs are different as L98 is separate and LT5 is behind pulley.
If this sounds strange......I will look again as I just fired up both engines.
I have no modifications regarding Power steering on either Corvette engine (1990 L98 and 1991 LT5)
Corvette Central has Aluminum Body Power Steering pumps (ZR-1) for $145.
https://www.corvettecentral.com/c4-8...f%3fcount%3d18
I did see an advertisement for rebuilt Corvette Power Steering Pumps without the ZR-1 Option.
Rebuilt ZR-1 Power Steering Pumps for $88 (Free Shipping).
https://www.ebay.com/i/253510303250?...SABEgKwMvD_BwE
Search Ebay (ZR-1 Corvette Power Steering Pump) and you will find several used ZR-1 Power Steering Pumps.
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ZR-1 Net Registry