Do you even NEED "crash bars" with an aftermarket plastic tank?
A sincere question; I thought the plastic tanks provided alternate protection (in lieu of nerfs) for the radiator, body plastic, etc.
With a steel tank, the nerfs protect it (along with the radiator and plastic). However, I understand the aftermarket plastic tanks are essentially indestructible, and provide protection to the radiator and plastic parts themselves.
If both aftermarket tank and nerf bars are needed for protection, news to me and I stand corrected.