Walt,
Even though I've been up all night I'd suggest that your memory is doing pretty good pard.
Lets see if mine is and I can get this right the first try.... The 8 3/4"/10" Octagon's had variations in both front and rear (long, short, etc), but I can't remember for sure on the rears. For the Contender 10", 12", 14", 16" and 21" barrels there was three different blade heights with the older vintage sights, and there is 3 different from them for the newer vintage (IOW, 6 different blade heights). They worked in conjunction with 6 different front sight heights as a set that depended on cartridge and barrel length.
It's not handy, but in my data base I have the actual heights of all of the fronts, rears and what front and rear was used on what cartridge/barrel length.
Larry