Ferrari and Mercedes are among several teams to change car parts between qualifying and the race at Paul Ricard.
Ferrari have swapped out the central plank section on Carlos Sainz's car, which will start at the back of the grid after engine penalties.
Meanwhile, Mercedes have changed the right-hand side engine floor stay on Lewis Hamilton's car ahead of the 53-lap encounter.
These changes were made with the approval of FIA Technical Delegate Jo Bauer, meaning no penalties are applied.
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More teams elect to fit new parts
Alfa Romeo, Alpine, Aston Martin and Williams have also made changes to their cars following the grid-deciding session.
Zhou Guanyu will run a new left-hand side front brake duct drum top bracket, and Fernando Alonso a new rear beam wing and left-hand side front wing flap.
At Aston Martin, Lance Stroll's car has been given a new chin strut bracket and Sebastian Vettel's a new leading edge floor panel.
In the last of the changes, Williams have changed the left-hand side rear brake duct exhaust panel and left-hand side rear brake duct inlet grill on Alex Albon's car, along with a new sensor power unit box for Nicholas Latifi.
As per the modifications at Ferrari and Mercedes, none of these moves incur penalties.
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