British GT champions Jonny Adam and Graham Davidson will defend their title this year with TF Sport, but will run with different co-drivers.
Aston Martin works driver Adam, a four-time series champion, will reprise his partnership with series returnee Ahmad Al Harthy from the Blancpain Endurance Series in which they won the Pro-Am Cup in 2017.
Davidson, meanwhile, will share another Aston Martin Vantage GT3 with graduating GT4 champion Tom Canning.
The cars will be entered under the Oman Racing with TF Sport banner, in deference to Al Harthy's personal sponsorship.
The 38-year-old, who added a second Blancpain Endurance Pro-Am title last year with TF Sport, was a British championship regular between 2013 and 2015 with Motorbase and finished runner-up in 2014 in the previous generation Vantage.
He replaces Mark Farmer, who has stepped back from the series after a confidence-sapping season in which he struggled to get to grips with the new-for-2019 Vantage GT3 and only managed a single podium after challenging for the 2018 title.
Team boss Tom Ferrier told Autosport: "They've all been with us before, they're all champions in their own right in the different disciplines they've done with us so for sure both cars will be strong.
"The aim is to finish 1-2 in everything we can."
Davidson (above with Adam), who fought back from a 56-point deficit after Silverstone to claim the 2019 title, told Autosport he was confident of repeating the feat in his second season with the team alongside GT3 rookie Canning, the winner of the 2019 Aston Martin Racing Driver Academy.
"Having won it in very difficult circumstances and overturning the huge points deficit, I believe that with a better start to the season, knowing the car, knowing the team that I would stand a stronger chance of winning it second time around than I did last year," said Davidson.
"The only variable this time around is Tom and, as far as I'm concerned, he has proven himself in GT4 and as part of the Driver Academy Aston picked him out of 23 other drivers, which says a lot in itself."
Canning, who tested the GT3 Vantage at Silverstone last year, added: "My goal for this season is definitely to go for the overall GT3 championship win.
"I know there might be some doubt on that, as it's my first year in GT3, but I feel confident that Graham and I can get the job done."