Welcome Vin,If not mistaken, the (XE) X Package included the same sport tuned suspension as included with the (ST) Sport Package, which lowers vehicle 0.4 inches front and believe keeps the same height in rear as vehicle without the package. Vehicle with the (FK) F Sport suspension option, lowered vehicle .5 inches front and rear I believe.
You could install the IS F suspension components. TOKICO manufactures the shocks for the IS F however, part number on OEM installed shocks differ from the TOKICO catalogue I believe; TOKICO (06 - 08 IS250/350): HX3797 - Front Right / HX3798 - Front Left / HX3799 - Rear Right & Left
(FK) F Sport package components or the F Sport aftermarket parts; PTR13-53095 RIGHT AND LEFT REAR F-Sport shocks, are another option.
Vin, if possible, would you be able to confirm your front / rear shock and spring part numbers, associated with your vehicle VIN with dealer or via search here, and provide the part numbers; Lexus Of Warwick https://parts.lexusofwarwick.com/oem-parts/lexus-coil-spring-damper-4834130110
Im interested in installing the suspension shocks / springs installed in vehicle with the Sport Tuned suspension; (XE) X or (ST) Package, such as yours, but have no way of confirming correct part numbers. Any additional information would be much appreciated.