Hi Jordan and welcome to the LOC, we are a friendly bunch and some of us even know how to pull them to bits and put them back together again, with of course the one bolt and washer left over.
Only place I can think of is Ebay, you could try googling to see if anyone is selling what you are after. Good luck with that.
We recommend you spend a couple of mins looking over the rules of the LOC, we will be asking questions later.
http://www.lexusownersclub.co.uk/terms-conditions/
Regards Mike.