Looking for RPO codes explanation

[Rick99TAWS6]

I am looking for an explanation of what three RPO codes I have really mean: R6J, R7X, and R9P

I have found them all decoded as:

Control Sales Item No. xx *Processing Option*
SALES ITEM NO. xx

Where the xx is 10 for R6J, 48 for R7X, and 90 for R9P

Anybody have an idea as to what these really are???

I bought this car(1999 TA WS6) new in December 98, still my daily driver.....
Car was special ordered and then the person ordering could not get financing. Never mentioned to me by the dealer was the Koni's on the front - so I am wondering if one of these RPO's is it

Thanks in Advance

[2001NBMZ28]

Dunno??? An old RPO code list I have shows R7X as "Security Package" though.