HELP. 69 c10

[olguy]

Hello all. New to group. I just put new trailing arms on my 69 c10 short bed step side. 12 bolt rear-end. I the arms are from POL. I now have purchased new parking break cables, the longest I could find at 42.3/8 inches (cable its self) sheath is 31.5 They DO NOT FIT. Too short. If I remove one side from the mounting bracket on arm, It fits with room for movement. The POL company says their bracket is where it should be according to originals.
Any suggestions here? I really need HELP.... This has been a 3 week ordeal and keeping me from moving on with my restore. I am tired of taking apart the drum brakes to get to the cable connection area on the bottom side of lever in drums. PLEASE, any info????? I know.....same dummy asking dum questions .. sorry guys.....