Mine is leaking, about to order the following parts. The only guide I could find is about the 2004. FYI VW is quoting me 600 for labor @ 2.5h. I would rather do it myself, to learn. Thanks in advance 
--- from sunnyvale VW
PART # D-SCRIPT QTY PRICE
022-121-117-C HOUSING 1 $110.00
021-121-119-A GASKET 1 $9.02
022-121-113 THERMOSTAT 1 $75.00
032-121-142 SPRING 2 $2.22 (EA)
N-901-368-02 SEAL RING 1 $5.14
N-903-168-01 SEAL RING 1 $2.40 Post thread
357-121-140 PLUG 1 $2.68
G-013-A8J-1L-DSP COOLANT 4 $12.33 ( Coolant is now sold as liters, 2 liters= 1 gallon)
These prices are BEFORE taxes.
total after taxes and a discount $281.55.
--- from sunnyvale VW
PART # D-SCRIPT QTY PRICE
022-121-117-C HOUSING 1 $110.00
021-121-119-A GASKET 1 $9.02
022-121-113 THERMOSTAT 1 $75.00
032-121-142 SPRING 2 $2.22 (EA)
N-901-368-02 SEAL RING 1 $5.14
N-903-168-01 SEAL RING 1 $2.40 Post thread
357-121-140 PLUG 1 $2.68
G-013-A8J-1L-DSP COOLANT 4 $12.33 ( Coolant is now sold as liters, 2 liters= 1 gallon)
These prices are BEFORE taxes.
total after taxes and a discount $281.55.