Re: Gold coloured engine bay bolts.
I used "Password:JDM" washers when I had my Zed with stainless steel bolts.
[img]http://i273.photobucket.com/albums/jj236/GMballistic/020_zpsvh8ozemk.jpg[/img]
Mine were red but they make them in gold too as below.
Password JDM gold coloured washers with stainless steel CSK bolts: http://www.ebay.co.uk/itm/GOLD-Password-JDM-Washer-Kit-8pcs-HONDA-SUBARU-CIVIC-INTEGRA-TYPE-R-JDM-EP3-EK9-/161581833108?hash=item259f071b94:g:xSUAAOSwBahUzWqk
I know Torqen can apparently supply "[color=#242627][font=helvetica, arial, sans-serif][background=rgb(230, 237, 240)]titanium custom bolts, washers and nuts, available in 6 colours - polished/natural, gold, black, green, purple, gold" as advertised in this thread: [/background][/font][/color]http://www.350z-uk.com/topic/97603-torqen-350z-de-engine-bay-dress-up-stuff-what-do-you-need/
Otherwise if you type "gold bolts" into the eBay search bar then literally thousands of options appear providing you know what size you want.
The other parts are worth keeping a close eye on the "for sale" section as those type of parts do pop up on here fairly regularly over the year otherwise have a look at some of the other excellent traders on here should you wish to buy new parts if you have no luck in the second hand market. Good luck.