The '86 VK Mr Moffat fenced at Bathurst in the same year was the #05 car for 1987 wasnt it, the one Gary Scott destroyed in a testing accident at Lakeside in '87...
As for a #05 Sierra... well there were 2 of them, one ex-Rouse works car that Andy Rouse himself had driven himself in Kaliber colours, and the one Brock's boys nailed together down here. The original #05 car became #105 after Mr Sheene destroyed the original #105 car at Winton in a testing accident...
There was a Mobil Sierra in WA with Mike Steele at one point, and another in NZ... the NZ one was turned back into Kaliber colours from memory, and advertised in Autosport for a huge sum....
I can recall in 1991, not long before Bathurst, the Brock mob having 3 Sierras, engines, gearboxes, panels, and a shedload of spares, all for sale for $220k. It would have been my first purchase after a lotto win...except the win never came