You're refering to the old wings from Yokomo (I think Fastrax also did them) with the massive side plates
The only ones that i've seen that are made from a similar material have been for 1/8th buggies which are obviously too large for a 1/10 car.
I have two of the original Yokomo wings - one on my RC10 & another on my Yokomo YZ-10
Yokomo - this one was trimmed down, as Masami had done on his original car.
RC10;
