Belltech 3121 3″ drop spindles for 63-70 C10 with 71-72 disc brake conversion. Normally run round $300. Get these at Walmart.com with free transport.
Get in on this deal my fellow C10 addicts. Just add a flip equipment and drop springs and shocks and you will have an inexpensive 5/7 drop.
Link to belltech web site for extra particulars:
https://www.belltech.com/belltech-63-70-gm-c10-requires-convert-to-71-72-disc-brake-or-equiv-3-quot-drop-spindle-3121.html
https://www.walmart.com/ip/117321724