I'll have to see if Photobucket pic will work or not...
I've had this triangular rack support on my Fuji since 1976/77. Probably sourced from Bike Warehouse (now Nashbar). Also of note are the old-school tire savers from the same era! Please pardon the grunge...
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'75 Fuji S-10S bought new, 52k+ miles and still going!
'84 Univega Gran Tourismo
'84 Univega Viva Sport
'86 Miyata 710
'90 Schwinn Woodlands
Unknown brand MTB of questionable lineage aka 'Mutt Trail Bike'
Plus or minus a few others from time-to-time