Athearn has announced a run of 40' 3 Bay ballast cars, and they have included Frisco in the roads offered. There are a total of 9 road numbers offered, one single car for $42.99 and 2 different 4 car sets for $149.99. ETA October 2023. http://www.athearn.com/newsletter/082622/04_ATHHO_40ft_3-Bay_Ballast_Hopper_082622.pdf
I will go ahead and comment that these are a generic car they're applying a Frisco paint job to. The 97000 series hoppers looked like this: http://frisco.org/mainline/wp-content/uploads/2017/11/Hopper-97057-at-Denison-Texas-in-1987.jpg Do what you want with that information.
The model appears to be based the old MDC Roundhouse tooling. There are pictures of two of the series on page 116 in Nolo's Frisco/Katy Color Guide to Freight Equipment. Rich
