Thanks for the info. Never thought to check at Lexus.
A friend of mine bought a GS from Lexus and 'they' (could be sourced from BC) replaced the battery. Matches up to what you say.
I have size 639 written down.
Make sure they fit this sensor back.
https://www.clublexus.com/forums/is-2nd-gen-2006-2013/885839-2006-is250-battery-casing-sensor.html
I have the same problem @moeomar95
Edit: Sorry service dilemma not your vibration issue. Actually I know a few people with that shape IS/GS and no issues at all.
@DiabloDane hey man I need spark plugs to be done in my next service (08 IS 250 180,000km service). The quote from Lexus is about R8,000. Will PM you then, I'm in PTA.
I bought ATE for my Lexus IS, R2,500 for front pads and discs and rear pads. Never had an issue.
Edit: Sorry ATE only makes the rear pads if I remember correctly. Other parts where a Stone brand made in PE or something.