Next Gen Nascar

So, I finally got some pictures -- from a model car magazine!! The new Nascar chassis appears to be quite sophisticated compared to previous generations and it very interestingly has bolt on front and rear stubs. These appear to be held to the center chassis with four (1/4 or 3/8?) bolts at each of four attachment points. There even appears to be alignment shims at each mount. Does anyone know if there are shear pins at each mounting point or are they restrained by friction alone?
Just curious.
M