Have you checked a Hollander interchange manual to see what other models, years, makes, might have the same spindle and brake set up? I went to www.car-part.com and selected 1970 Buick LeSabre (pre-79) spindly and the search came back with info about a 68 and a 69 Riviera. Are these interchangable? If so, there are a couple of them out there on this site.
I also found this 69 LeSabre on the Jaxed Mash site (it's compilation of all of the craigslist, ebay, and hemmings ads from the entire U.S.)
http://atlanta.craigslist.org/nat/pts/1655667857.html
I did a quick parts check on AdvanceAutoParts.com comparing a 68 Riviera to a 70 LeSabre and they both show the same part number for the front brake rotor. Your field from which you have to choose might be bigger than you're seaching.
Ed
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