Try Ozbox for side panels.

Rare Spares are repro-ing HQ nosecones, I saw the samples 2 weeks ago.

If you can't find a good HQ single headlight support panel, and you can weld OK you can convert your HZ one by cutting the headlight pieces out of a rusty HQ one and welding it into the HZ one. I used to do this in the 80's when I was making twin headlight fronts out of smashed fronts. I could never get enough good support panels so I used to get HJ-HZ single examples and weld in the headlight bits.

You'll still have to find good guards and bonnet though. Rares now have good grilles with stainless and headling surrounds.