Not sure how much this will help you. On my '74 K20 I used this Dynomax dual exhaust kit- its been on the truck for 20 years so its not as pretty as it used to be. It was easy to install and everything was included like hangers, clamps, donut gaskets, etc. The stainless tips are extra and not included with the kit.
https://www.jegs.com/i/Dynomax/289/89003/10002/-1
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
'17 GMC Yukon XL
VCCA member #58596
http://www.nohrco.com