Tasca Volvo list two: "Cam type" and "Koyo type".

How do I determine which one is on the car now...or does it matter?

Also, when I drill down through the parts finder to get to "Rack" it shows the above two types with near-identical prices of about $340. Anyone know if this includes inner tie rods and boots...and core charge?

Further, if I search using the Volvo p/n of 5003966 it shows one (unidentified) rack at a price of $851.45. I understand that p/n's beginning with "5" indicate a rebuilt item, so why the big $ difference?

FCP list a rebuilt rack at $399 with a $150 core refund, for a net $249. Presumably you have to pay to ship them the core.

Aside: Tasca's online parts finder has no listing for a 1998 S90, you must enter the car as a 1997 960 to find parts. But I believe the cars are effectively identical.
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Bob: son's 81-GL, dtr's '94-940, my 83-DL, 89-745(V8) and 98-S90. Also 77-MGB and some old motorcycles.