It seems to me that there are at least 2 "correct" shift gate inserts.
One for the early, unlighted, shift gate and one for the later lighted shift gate (all 280 SLs I believe
).
Mine has the light. The SLS style is correct for mine ! But, I bought mine at Miller's (I am not affiliated with Miller's).
Please see the pictures. The 1st picture shows the new on the left and old on the right. See the slot in the plastic at the top. It is needed to allow for a wire retainer for the light wire. Also see the feature in the metal part where the wire fits. The second picture shows the wire location close up.
The third picture shows the new insert installed. It is not perfect because I messed with it for about 3 hours over a 5 day period and deformed it a little.
I tried hot water, boiling water, and a hair dryer. All of these failed. The boiling water distorted the plastic and I recommend you DO NOT use boiling water...
Then, I took out my dremel and undercut the boss that sticks out through the metal. That way the metal could slip under the boss and give me enough clearance to get it in. IT WAS NOT FUN...
I'm happy with the way it came out.
Advise: First see if it fits. If not, start with the dremel and you'll be done in no time.
Good Luck and I hope this is helpful.
Mark