Easiest place to order is https://www.worldimpex.com/

038253019C (exhaust manifold with turbo)
037253039 (gasket for the exhaust manifold) (need 4)
N90200201 (hex nut on exhaust manifold) (need 8)
N90095501 (washer on exhaust manifold) (need 8)
N0138123 (sealing washer) (need 2)

These items are optional and add about $100 to the total cost but can pretty easily be damaged during the install or removal. According to
Joey @impex and Bruce about 50% of installs.

038145771D (oil pipe) (just in case)
038145736C (oil return line) (just in case)