The information below is from RealOEM.
The link is here.
No.
Description Supp. Qty From Up To Part Number Price
Notes 01 Remanufactured coolant pump, mechanical
1
11517805812 $192.79
ENDED 01 Coolant pump, mechanical
1
11517801063
02 Gasket Steel
1
11517793796 $13.58
03 Torx screw with collar M7X42 4
11147792545 $0.72
04 thermostat with adapter
1
11517805811 $52.64
05 PROFILE-GASKET
1
11517787692 $6.02
06 O-ring
1
11517788984 $1.19
07 backup ring
1
11517788985 $1.61
08 Hex bolt M6X20-ZNS3 4
01/2013
07119904169 $1.25
ENDED 08 Hexagon screw with flange M6X20 4
07119905546 $6.73
09 Connector
1
11127806196 $10.41
10 PROFILE-GASKET
1
11122247745 $5.44
11 Hex bolt with washer M6X25-ZNNIV SI 3
07119905400 $0.65
Notes
- ENDED = the part has been discontinued (no longer available).
So you have the proper part numbers. As shown above, part #2 is "Gasket Steel" - and I remember mine as being metal, but with a black coating on it - as shown in the pictures of diegoX's posts 156 to 161.
I suspect you have the proper gasket - maybe the black coating made you think it had a plastic component?
Anyway, good luck with the job!