Crash Carshape Lotus 49 1967

Hi guys.
I am preparing the 1967 mod, for GP3 1.13,
and I used this carshape based on Lotus 49,
[drive.google.com]

But every single time i crash with a car in rear part of an other, the game crashes also!
Is there someone can tell to me what is it? Why there is this error? Can I fix it?
Thanks A Lot!

I think the problem may be the missing pushing wings on the cars.

I remember that in the years wing car (no front wing) in the frontal crash of a car has been broken wing that was not there and followed the fall of the game!
I'm not an expert and I do not know how to fix it but it's just an idea.

Hi.