Cone Air Filter for 1987 GTV??

[juzzyp]

I'm having some trouble tracking down an cone filter for an Alfa Romeo GTV 1987 model, unfortunately it's no normal GTV and it's had a Alfa 75 3 litre V6 lump dropped in it, and it's not running a normal panel filter.

Does anyone know of any specialists that can sort one out or a place I can source one from.

Cone filter looking a bit frizzled now, bit worried for the engine.