Front - 1995-2022 - NPR and NPR HD - W35/3500, W4, and W45/4500
NPR (Isuzu); W35/3500, W4 and W45/4500 (Chevrolet/GMC)
1995-22
From July 1995 for diesel engine; From October 1995 for gas engine
Dayton uses the sway bar bracket on all these springs
Full tapers: Left and rights ARE different; Multileafs: Left and rights MAY be different
See remarks for general guidance on where springs were used; Dates are in Month/Year format
RB-186 end of spring to rear; RB-186 is a flanged type RB bushing with 2 per eye
RB-173 and RB-228 are dimensionally the same and are interchangeable