Kostecki will become the second Supercars driver to make a NASCAR cameo this year following Shane van Gisbergen's sensational debut victory in Chicago earlier this month.
Kostecki and van Gisbergen will both be on the Indy road course grid, the latter making a second start for Trackhouse Racing, while the former makes his debut in an extra RCR Camaro.
The major backing for the Kostecki car is coming from Peter Adderton's MobileX company.
However, Supercars itself will also help fund the ride with prominent signage advertising its international SuperView streaming service.
The move comes amid an upswing in interest from US viewers in Supercars following the van Gisbergen debut.
“We’re very excited to be backing Brodie and his team on his NASCAR debut with the SuperView advertisement,” said Supercars CEO Shane Howard.
“Shane van Gisbergen’s spectacular victory earlier this month was seen around the globe, and we received more than 14,000 expressions of interest in SuperView within days after the win.
Source: Autosport