Just about every spindle I've ever seen (even aftermarket) have a P/N on them.
Hopefully it matches the list above, or it's something aftermarket and you can google it.
Not a big deal, you'll get it figured out.
Then when you do, order your drop spindles to match what you have, they'll be 67-70, 71-72, or 73-87 (I'm not throwing out the possibility you have 67-70 aftermarket disc spindles at stock height... stranger things have happened).
I'll throw in another wrench... are you sure you don't have drop spindles already and the springs were just never lowered?
