The current Moog replacement bushings have the identical "HARRIS" labeling on them as well as the same numbers as the NOS 1LE F body bushings I have in my possession.
I wouldn't think twice about using them.
I agree. The NON-1LE/B4C/FE2 Camaro/Firebird suspensions had "waffle" bushings, which seemed incomplete. They were more like rubber crosses shoved into the bushing outer sleeve leaving gaps around the bushing area. The Z28 4th gens used the same bushing as the 1LE. No big deal.
I can't say for sure, but I learned enough about them to suspect the "1LE bushings" weren't much more than full rubber bushings instead of the waffles. Could they be of higher durometer than say, the G-body full rubber ones? I dunno. Maybe. The interesting thing is that they're designed under that part number as applications only for the F-bodies. They will fit a G-body. I'm still not sure of any performance advantage over the G-body stock full rubber bushings, however. Maybe there is, maybe there isn't. Nobody's ever tested that, it appears. But these will flex.
After SLP was done doing the Camaro SS/Firebird Firehawk program in early 2000s, Dave Hamburger started selling off extra stock of SLP's (actually GM's 10164152) 1LE suspension bushings a few years after that, after the warranty periods ran out and SLP was no longer required to have warranty parts on hand. I bought a couple dozen off him then for a really decent price thinking I'd keep my 2002 SS forever. Sure enough, they're GM/Harris bushings, so it doesn't surpise me if Moog is still buying/packaging them.
"1LE" bushings have these markings...
Here's a post I made about a year and a half ago about control arms the 1LE bushings:
G-body LCA is 19.25" center to center. A-body LCA is 22" center to center. Not sure about the bushings.
But while we're on the bushings, there's always been this lore of 1LE bushings being the better LCA bushing. Even in the Camaro world. GM p/n 10164152. Heck, I even believed it 10 years ago. When SLP was getting rid of junk, I scooped up a couple dozen of the bushings for cheap, among other Camaro SS stuff.
An interesting thing happened on the way to the fair, however. While the 1LE bushing is indeed much firmer than the NON-1LE waffled bushings that came in the lesser performance versions of the Camaro, it is in fact, no different than a comparible full-solid Moog bushing. This was confirmed when the owner of a 4th gen Camaro changed out his LCA's for "1LE" LCAs. The 1LE bushings from GM had HARRIS, B68, 62538, FG molded into them. Interestingly, the Moog stock replacement bushing for the Camaro (K6178) had the same info molded into its bushings. They are essentially just a solid bushing vice the waffled ones. This is why they are perceived to be "better" than the stock bushings. But the better part is that they're not waffled.
If I had a Camaro parts book at the time I probably would have figured it out. I do now, though. The parts book says the 1LE bushing is the same p/n for FE2 (standard Z28), B4C (police) or 1LE application. Nothing special here.
Moog K6178 is the part number. Not sure what the newer ones look like nowadays, but it has been confirmed by the Camaro guys that it's the same bushing as the famous "1LE bushing". So if you see anyone pushing the Z28 bushings...
Another interesting item you see in the parts book from Olds is the "regular" upper LCA bushing is 10000068 (and lower for all) but the W40/W42 with 8.5 ring gear UCA bushing is 22526178. Another interesting point is that the K6178 is the standard replacement for EITHER of those. I couldn't tell you what, if any, difference there is for the 22526178 bushing vs. the 10000068. No idea.