I was working on this car for my neighbor, it has been sittng for years and I replaced the fuel pump and got it started, but I noticed there is a gromet on the top of the air cleaner and it looks like whatever was supposed to be there is gone. (can be seen in this picture) http://i735.photobucket.com/albums/ww351/mercedesbenz911_photos/Parts%202/1595dd15.jpg

What is supposed to go there?

Nothing. It is the access to the fuel mixture adjustment with the air cleaner installed.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Hmm that makes things easier, this is the only gas V8 car in running condition I have seen under the hood of so I wasn't sure.