I'm putting a rebuilt 10-bolt 8.5 rear end into my '66 Skylark, and I'm about to upgrade the rear suspension. I've found the appropriate lower arms, springs and shocks. But I can't seem to determine which upper trailing arms to get... Summit lists Hotchkis #1202 as being only for '64-'67, and lists #1203 as being for '68-'72. Since I have a '66 with a '72 rear end, which part should I be looking for? As far as I can tell they have the same dimensions. Anyone know? Thanks very much!