Thought it might be easier if all Wedgers to put what they think is the right part number down for all different parts of the car to help each other out. [Add as many as you want].
PS - I've collected a few part numbers for the 350 S2 Wedge from various sources [website,manuals and friends]before getting a 390. You would still need to double check just in case.

TVR 280I.

Spark Plugs - Ford capri MK3 2.8i - BP6ES
Coil - Ford capri MK3 Intermotor - INT11400
Distributor Cap - Ford capri MK3 2.8i (Bosch type) Intermotor part - INT44010
Rotor Arm - Ford capri MK3 2.8i Intermotor -INT48790S
Spark Plug Leads - Ford capri MK3 2.8i Duratec - DIL618
Thermostat - Ford capri MK3 2.8i - FCT6106381
Water pump - Ford capri MK3 - FCWP4
Fuel filter - Ford capri MK3 2.8i - WK618
Fuel pump - Ford capri MK3 2.8i - 0580254910
Fuel Injectors - BOSCH 0-437-502-019
Power Steering rack - Cortina MK5
PAS pump - Ford capri MK3 N/S mounting..Maestro/montego O/S fitting.
Track rod ends - Cortina MK4-5 - Granada MK2 - Equivilent to Ford Part Number 5021411
Steering UJ's - David gerald - OD measurements of the top and bottom column's and length of old UJ needed.
Trailing Arm Mount/Bush & Pins - ML performance or RT racing.
Rear wheel bearings - Granada MK2 but with an extra seal - QWB140C
Upper & Lower ball joints- Cortina MK4-5
Brake master cylinder - Ford cortina MK4-5 (3 Pipe type)
Payen Head gasket set - DL401


TVR 350i S2.

Air filter - K&N E2029.
Airflow meter -- XMB2046 - Rover SD1 Vitesse.
Alternator drive belt -- QBA1125 -- 1125MM long V belt.
Brake light switch --TM0325.
Coil -- unipart - GCL143 - Rover.
Distributor - Lucas - 41935A.
Dist cap -- Lucas - GDC117 - Rover.
Expansion tank - Ford - 6061947 - MK2 Granada.
Fuel filter -- Fram - G3829.
Head gasket set [standard] - Unipart - GUG1066HS - Rover.
Ignition module - Lucas - DAB135.
Oil filter - Unipart - GFE295.
Oil pressure switch - Unipart - GPS123.
- Intermotor - 50510 -Landrover 3.5l.
Reverse light switch - Rimmer - TKC6761 - SD1.
Rotor arm - Lucas - DRB195C
Spark Plugs - B7ECS.
Speedo cable - Unipart - GSD380.
Starter motor - Lucas - 3M100.
Sump gasket set - Unipart - GUG1538CS - Rover.
Sump plug washer - Unipart - 213961A - Rover.
Water pump - Unipart - GWP2194 - Rover.
Water pump gasket - Unipart - 610756 - Rover.
Clutch master cylinder -- Unipart - GMC1015 - Rover.
Drive shaft u/j - Hardy spicer - HS163 - Heavy duty version with g/nipple.
- Quinton Hazel - QL2104.
Lower ball joint - Ford - 1613139 - MK IV Ford Cortina.
Rear wheel bearing - SKF - VKBA624 - MK 2 Granada.
Steering rack - Unipart - GSR631E - MK IV Cortina.
Steering rack gaitor - Unipart - GRG210 - MK IV Cortina.
Track rod ends - Unipart - GSJ119 - MK IV Granada.
- Quinton Hazel - QHNQR1384S.
Upper ball joint - Unipart - GSJ122.

TVR390SE.

Rear Brake Calipers [390SE]S2 -- DC71649 and DC71648. Also CA4 and CA4R.
Track Rod Ends [390SE]S2 -- Ford Cortina MK5, 2LTR, 2.3LTR.

TVR400SE.

Rear Brake Pads [400SE] -- JAGUAR/XJS/3.6/83-92 DP3101C (Red Stuff)
Hand Brake Pads [400SE] -- JAGUAR/XJS DP709
LH Rear Brake Caliper [400SE] -- Jaguar XJS TCA005 Brake Caliper
RH Rear Brake Caliper [400SE] -- Jaguar XJS TCA006 Brake Caliper

TVR420SE.

TVR450SE.

TVR SEAC's.