It’s all about the spacing, you have to measure the spacing of the TOB and the clutch fingers. There’s instructions videos by zzp
This is my full report for 2023, RE: Transmission stuff. If you're not interested in starter plates and such pass over all of this post.
In my Junk yard trips(as I was searching for parts I needed like maybe a Fiero shifter? I was surveying for those "starter plates", as the plates are no longer available new.
I generally only found them on F35 applications, ALL F35 units I found had that plate.(to be scientific, I found roughly 12 units in Montana, Idaho, Utah, AZ and TX.) I found 2 similar looking plates on Automatics?? Weird! Those may have been a different thickness but I did not measure any of them.
I saw ~5X as many F23(much more common trans) and only one had that plate; it was an F23 behind a different Saturn motor, pre 2005(same bellhousing pattern). I found an F35 in a larger Saturn sedan!?(LSD? unknown, IIRC, bolted to an N/A EcoTec motor.) Many F23's in Ion models. I surveyed Cobalt, HHR, G5, G6, Ion and most Saturns. Also Saab 95(?)Equinox and Saturn Vue. I also searched many 2000-2004 Saturn, Cavalier/Sunbird(Fire?) EcoTec motors started in these models some date after 2000. Except the one above, I only recall seeing F23 behind Ecotec motors.
I did not survey any Sky/Solstice as none were found and use a very different RWD trans.
I know the Eco Tec was used in the Malibu models as well, but have never seen a Malibu with a manual trans.
I have seen one G6 with an F40 in El Paso(summer '23, Boy was I surprised!). I have seen one Regal with an F40(Spring '23) 2) F40's in SAAB's; oddly all found in Springfield, MO. I was not surveying for the Starter Plate then, so unknown IF the F40 used it. I didn't even look at their motors! Probably turbo? I should have bought those Missouri F40's as the junk yards wanted $110. each. Salvage man said he KNEW they only fit those cars and nobody was searching for them!?? Live and learn! IF the guy at the junkyard is selling cheap because "nobody is calling him for that part", buy, pack the stuff up and leave quietly.
I did not see any Opel, Vauxhall or Alfa Romeo.