Bit of a weird one here, but hope someone can help. Recently fitted a Blitz Sonic Power Air Filter on to my old MY02 WRX. Unfortunately when fitting it I dropped and lost one of the spacers that separates the screws that attach the MAF unit onto the intake pipe. It is like a small brass cylindrical tube which the screw goes through. Does anyone know where I can get one of these or similar?

 

I know this my sound strange but try B&Q !, they sell metal tubes of different diameters (normally by the nuts, bolts and screws section). I know as I bought a 30 cm alloy tube to make some spacers for speakers.
Other than that try a model shop as they sell stuff like brass tube for modeling

Hope it helps

Richard