My car was originaly a series 1 R31 with an CA20E, which now has had a VG30E dropped into it. I changed the bumper to a series 3 GTS 2 door. Then I changed the headlights to series 3's, but couldnt use the original grill (which is crapy anyway), so I got the Ti series 2 honey comb groll with the S badge and in order to have that installed you need to get a series 2-3 front filler panel which is very expensive and made of fiber glass. If you stick to your series 1 bonet, you will have a gap between the grill and bonnet (middle section), wich doesent look too bad, more air flow. If you like, I can get some pics organized.Â
You could try the series 1-2 spotters with the series 3 standard or gts front bar which would look good, but you will have to change the filler panel and grill.
Also if you wana change the tailights to the hotplates, and if you want to use the series 3 rear garnish, you will have to drill holes and cut into your existing boot backing were the numberplate sits to fit it, because series 3 has the backing part seperate from the boot I think.Â
Hope this helps you out.