My car (2010 GS450h) is missing the engine and gearbox undertrays. I've had a quote from Lexus, but (unsurprisingly) it's eye-wateringly expensive...
I have part numbers from them, but am tying myself in knots trying to work out whether there are any other candidates to find used parts from. I'm writing this as much to store my notes / clarify my thoughts as anything else, but any input would be appreciated!
The numbers quoted for me by Lexus are:
51410-30161 main engine tray
51442-30171 gearbox tray
Taking the engine tray first:
From an online parts catalogue against my VIN number I had found: https://lexus-europe.epc-data.com/gs450h/gws191r/5066/body/5102/51441D/
...which says that the part number is
51410-30160 - note the alternative final digit!
I believe it also suggests that the part number for earlier cars (51410-30101) has been substituted with the number above, so I'd expect the earlier part to also be compatible with a later car. Anyone see any reason (deleted mounts on later chassis versions?) why this wouldn't be the case?
Extrapolating further, an alternative source (https://www.lexuspartsnow.com/parts/lexus-cover-assy-engine-u~51410-30161.html) suggests that the same part is also compatible with an '06 GS300 - that makes me wonder whether actually ALL 3GS undertrays might be interchangeable. I also found a 51441-30401 for sale as from a 450h, and another as from a 300. If I just need one from any 3GS it will be rather easier for me to find a spare...
On the gearbox tray:
51442-30171 - number from Lexus
51442-30170 - number from epc-data - last digit different again! Stated as '06- so I'd expect all 450h parts to be the same at least.
Lexuspartsnow says that ...170 fits '07-'10 (and was replaced by ...172!) and ...171 fits '09-'11.
...150 and ...152 are numbers I've found for a GS300 but not found any evidence of overlap yet.