FYI, Oct I find the following from Pam's link:
https://www.scca.com/pages/cars-and-rules
FV
1. #24977 (Formula/Sports Racing Committee) Request Spec Tire for FV
In GCR section 9.1.1.C.3.D, make changes as follows:
The following tires are required:”
“Fronts
Hoosier #43337 FVS
21.0 x 5.0 x 15”
“Rears
Hoosier #43353 FVS
22.5 x 5.5 x 15”
“Rain tires are open for 2019.
Effective 1/1/2020, the following rain tire is required:
Hoosier #44266
22.5 x 5.0 x 15 Hoosier WET (rain)”