Expensive mistake.
LH & RH 1984 GM CK Parking brake lever kits are 15594177 & 15594178
You probably need the star wheel... 21, 22, & 23 from the GM illustration.
Likely you need the brake adjuster arm parts 9 & 10. Part numbers are in subsection 5.103
Sounds like you found the strut #12 but you are probably missing #13
I'd be willing to bet the spring kit doesn't have #25 either.
Download the 79-84 GM parts books from the manuals link in my signature
or look at GMPARTSWIKI.
http://www.gmpartswiki.com/getpage?pageid=58098
http://www.gmpartswiki.com/getpage?pageid=59845
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.