Hi Matt, I will ask the buyer if he want the 8-tracks. If not, I will let you know! *edit* - he responded and said he would like to keep them. Thanks!
Now on ebay. https://www.ebay.com/itm/295476434882 and CL for $25k. https://fortwayne.craigslist.org/cto/d/angola-1969-buick-gs-360hp-numbers/7579213868.html