I just checked my rec't from 3/11/06.
Part# pa 7563497 184117 $38.99 & Part# pa 7563505 184116 $29.99, plus a $10 core charge on each. I did use a friends shop resell account.
I was a few bucks off but only by $30 total.
Cadillacs Only charged me a cash price of $34.13 for the arms and springs. 3/22/06
I wont doubt you got them at that price, but it's not what they are quoting on there site and you got one extremely good deal. I suggest you give your parts manager a reach-around for that price.

