http://www.proctorjones.com/pjonline/product.asp?s%5Fid=0&dept%5Fid=11810&pf%5Fid=725&
it says wide...im planning on mounting on the invader 171...its 83 mm in the middle. will these be too wide? i think they might be 85 because on getboards it says the 2008 look px12 jib fit up to 85