Your welcome Andy, i bought those from Lidl of all places about 4 years ago lol, but there the same as the ebay ones.
http://www.ebay.co.uk/itm/2-x-Chrome-Silver-Indicator-Bulb-382-LEXUS-IS200-mk1-s-/160620744128?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2565be0dc0
Those should be the same as mine, they look more silver than mine do but the silver does fade with use over time.
Yes that's the standard Lexus zorst, but i believe that it was an optional extra, their really hard to get a hold of now, and the ones on ebay are not gen lexus parts but cheap copies, so watch out.