Ahhh, my bad... I didn't realize you had an Aristo. I have a bunch of brochures for them, but since I can't read Japanese- that doesn't supply the answers either. I'd just use the factory housings and put a nice set of 6.5's in them... just have to figure out what impedance they are. I think the "Mark Levinson" system in the '01-'05 GS430's like mine are 8-ohm--- or at least the subwoofer is.

Where are you located, matrucious?

And CurlyG....is your car an RHD Aristo, as well?

 

Looks like your stock JBL's are 6.75"
link: https://www.lexusownersclub.co.uk/fo...n-aristogs300/

Also...there's this: https://www.ebay.com/itm/35103064736...Bk9SR8yKrNegXw