The OG Skyline mat in my car has the heel bit half disintegrated so was thinking of replacing them.
What would be your estimate for thickness (just curious)? 2cm?
What wheels do you have?
GTS-t = 16x6.5, 205/55 tyres
GT-R = 16x8, 225/50 tyres
from memory
I recommend: https://www.tyresales.com.au/buy/tyre/bridgestone/potenza_adrenalin_re003/205-55r16/126037?q=4&delivery=NSW
or
https://www.tyresales.com.au/buy/tyre/michelin/pilot_sport_4/205-55r16/161279?q=4&delivery=NSW
sadly Hankook V12 are out of stock, as that's what I run on my turbo Liberty and highly recommend them.
You can try to find a flasher relay that's "LED compatible", or run load resistors (half defeats the purpose IMO).
I got some Philips resistors if you're interested (I bought TapTurn relay).
CANbus is for newer cars that would throw an error light if a bulb was out.
I haven't looked at R32 headlights in a while (shame on me) but that could be the high beam reflector?
As for LEDs, I personally wouldn't bother unless they're using Koito projectors, but I guess if you want a bolt on solution it'll do.
Did it come with this thing?
Also the projectors are junk, you've be much better off retrofitting with proper HID projector. Even bunging in an adaptor plate for H1/H7 etc halogen buib into said HID projector will be an upgrade.