Morris Jnr has been suffering from back issues and sat out of today's opening race, which was won by father Paul Morris.
The call to step into Nash's entry was put out to Ingall, who dropped what he was doing at home on the Gold Coast and flew out to Tasmania on Saturday evening to be at Symmons Plains in time for SST's two Sunday races.
“I rang him at 1:45pm, and he was in the middle of pouring concrete,” explained Nathan Cayzer, SST Australia category manager.
“He stopped doing that, I arranged for a car to pick him up, take him to the airport, and got him on the plane.”
Ingall's arrival makes for two Bathurst 1000 winners on the SST grid, alongside Morris Snr.
It won't be Ingall's first taste of the unique category, having previously competed at Sydney Motorsport Park and the Gold Coast.
“But to also have two Bathurst winners in Russell Ingall and Paul Morris, but also as we know them Enforcer & The Dude; it's exciting for us, and I don't think it will be the last time we see it either.”
Race 2 for SST takes place at 11:50 AEST followed by Race 3 at 14:50 AEST.