OK if you are sure that you want to fit the cooler then here's what I have done.
I bought all Mocal parts from this company and will put the list of parts at the end.
eBay UK Shop - Matt Lewis Racing: Oil cooler kits parts, Motorsport equipment, Fuel system - injection
I've used 5/8" rubber hose for the complete installation and this is one of my biggest concerns about what I've done - you can see from Chris's pics that there is very little room between the GTA oil cooler steel pipes and the exhaust. What I have done is to fit larger hose over the rubber hoses to give extra protection - I was planning to fit corrugated metal insulation or protection plate to keep the hoses safe from the exhaust heat but havent done it yet.
I bought a side take off plate instead of the normal take off plate and one with M20x1.5 thread to replace the oil filter. I needed this due to the very very limited space in the 156 where the original oil filter is located.
I ran the hoses from the take off to under the wheel arch to the oil cooler and remote filter. I also fitted a take off plate for the oil temp and oil pressure. I used a narrow cooler to fit under the wheel arch but you should be able to use a normal length one if you are fitting it in the front of the car and this will keep it away from the power steering coiled cooler which you can just see behind the oil cooler. I have since fitted a guard behind the cooler to direct the hot air away from the steering cooler.
Something to note is that the remote filter kit only comes with ¾” oil filter thread and I used a K&N Gold Oil filter – I checked its specs against a standard Alfa one and they are very similar.
I didnt use a thermostat because I'm still using the existing oil / water cooler so this would keep the oil temp at the correct level but I wanted some extra cooling if required if / when I can use the car on the track.
Parts required - if buying separately - a kit would already include some of this – I think I ordered a Remote filter kit for something like the Cosworth which has the 5/8" bsp connections. I requested a side take off plate instead of the normal one and one with M20x1.5 thread
16 row 135mm Oil Cooler – 5/8” bsp connections
5/8” 90deg pipe unions x 2
Take Off Plate M20x1.5mm (I used side take off) – 5/8” connections
Straight 5/8” pipe unions x 2
Remote filter with 3/4" thread – 5/8” connections
5/8” 90deg pipe unions x 2
5/8” hose – 3 meters
Hose clips
Oil Temp / Oil Pressure take off plate with 3/4" thread - not from Mocal
Oil Filter – K&N Gold (HP-1002) with 3/4" unc thread
Thermostat – I didn’t fit one but would probably need 2 pipe unions too.
BTW in the previous picture the bigger cooler is actually the gearbox cooler

Alfa 156 2.5 V6
Cosmos Blue Metallic + Tan Leather, 17” GTAs, 225/45 Michelin PS2's, Full Zender body kit, GTA Headlights, Eibach springs, Bilstein dampers, Novitec Anti-roll bars, Brembo calipers, 20 Groove discs, DS2500 pads, Squadra ECU, 45mm intake runners, Carbon Intake pipe, Novitec Twin DTM exhaust, Front strut brace, Aluminium undertray
Alfa 156 2.5 V6 ..........Red + Red Leather
Alfa 156 Selespeed .....Silver + Red Leather
www.alfastorm.com