Challenge and GT Cars

Hi!! I have this beautiful new safety net OMP 90 years, I am sure that it belonged to a Ferrari kit challenge or GT. I thought it was for 348 challenge, but given the shape of the roll bar I'm not so sure .... someone knows something more?
accepted explanations: D
here photos: thank you all

They used this mostly in the US, am I right?

i think yes, but i had see this used in photo of 348 , 355 challenge...but i don't have a lot information