Welcome to the club 👍🏻
This was a previous thread on the subject ……
https://www.lexusownersclub.co.uk/forum/topic/133858-no-abs-or-vsc-on-sc430help/
You need to get yourself (or borrow) a code reader and see what the fault codes are.
Two lines of thought ….rear driveshaft reluctor rings or oxygen sensors in exhaust ….get the codes read to be sure 👍🏻
Think the spec Neil put up was what each car has as wheel nuts.
The Lexus will be M12 x 1.5 wheel nut thread regardless of wheel fitment.
Tricky bit is finding a M12 x 1.5 that fits down the Maserati slim will nut holes.
The 21mm head original nut won’t fit, so maybe a 19 or 17mm head nut might be required .
I had some trim damage to the Centre console when got my previous car back ☹️
So try give the job a good look over before you leave the dealer.
In contrast, many members on a previous Lexus forum had no problem at all 👍🏻
Wrapping the dash and window switch panels has been done many times over the years, it’s all down to personal preference. For me I like the "classic" dark wood look, yet others like a more modern carbon fibre look.
If they are the standard SC430 wheels, spec should read ..
PCD 5 x 114.3
Diameter 18"
Offset 45
spec should be embossed on the back of the wheel spokes 👍🏻
Have heard of another belt jumping that was a recently replaced item, all a bit odd as it has a hydraulic tensioner so sets its own tension. Let’s hope it’s not a new problem .
From memory the seat back clips in at the top and is screwed in underneath.
Take the seat fully forward, torch and a mirror ..screw each side.
….bit tricky to get at ☹️
once you have it off you can see if any parts are needed 👍🏻