Here is a parts list for DIY'ers who want to convert a Bus/Bug to Subaru power. I've supplied these part number but do your due diligence to make sure they'll fit your application. I've had great luck with these parts myself. Enjoy the build!

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BUSARU/BUGaru Conversion Parts List: Approx. Pricing  
BUSARU Engine Crossmember, Throttle Body Reverser, Vehicle Speed Sensor (TBR and VSS are only parts needed on a BUG) $449 https://busaru.com/busaruparts
     
Wiring Harness Conversion $629 BUSARU Harness Conversion
     
KEP Manual/Auto Transmission adapter kit, Exhaust Header, Catalytic converter and welded Muffler assembly, Muffler Bracket (Adapter plate kit is only part used on BUG) $1,250

002 Transmission adapter kit

https://www.kennedyeng.com/subaru-vanagon

     
Optional: Large heater assembly $190 Large Heater
     
Optional: Shortened Oil Pan $270 https://www.outfrontmotorsports.com Must order over the phone. You can see video of me installing on the BUGaru HERE and on my personal bus HERE
     
Inline Fuel Pump $75 Fuel Pump
Alternator Belt  $19 Alternator Belt
     

Optional: OBD2 Gauges/Reader

$99 OBD2 Gauges/Reader

Clutch Kit

$127

$97

091 Trans Clutch Kit

002 Trans

6 Port Fuse Holder

$10

6 port fuse holder

Universal Intake, has enough bends to play with

$73

DIY Intake Setup

Engine-Bay Radiator Setup (Bay Window BUS):

More info here: Which Radiator Setup?

   

Driver Side Radiator

Driver Metal Trim Fan

Fan mounting kit

$53

$60

$8

Driver Side Radiator

Driver Side Fan

Fan mounting kit

Passenger Side Radiator

Passenger Radiator Fan

$40

$32

Passenger Side Radiator

Passenger Rad Fan

BUSARU Radiator Filler

Radiator Cap

$75

$6

Rad Filler

Rad Cap

Radiator Hose Driver Side

$7

Driver Side Rad Hose

Radiator Hose Passenger Side

$20 Passenger Rad Hose
Coolant Bottle $10 Coolant Bottle
     
Metal Tubing: I like going to the local metal shop to source, but you can go with this or EMT from hardware store

$23 Alum.

~$10 EMT

Aluminum Tubing

Belly Mount Radiator Setup (Bay Window BUS):

More info here: Which Radiator Setup?

   
Belly Radiator  $153  Belly Radiator
Radiator Fan (needs slight modification)  $51  Belly Rad Fan
Fan Mounting Kit  $10  Fan mounting kit
Radiator Hose  $9  Belly Rad Hose
Radiator Hose (QTY 2)  $50  Belly Rad Hose X 2
Radiator Hose  $12  Belly Rad Hose
Radiator Hose  $12  Belly Rad Hose
Inline Radiator Filler  $23  Inline Radiator Filler
Upper Radiator Cap  $7  Upper Radiator Cap
Lower Radiator Cap  $8  Lower Radiator Cap
Coolant Bottle $10  Coolant Bottle
Metal Tubing: I like going to the local metal shop to source, but you can go with this or EMT from hardware store

~$50 Alum.

~$20 EMT

Aluminum Tubing