SW20 Charcoal Canister replacement

The OEM Charcoal Canister has been out of production for many years.
 
So would anyone know of a suitable aftermarket replacement for a Charcoal Canister on a 1990 SW20 Turbo?  I would like to maintain the Charcoal Canister (rather than remove it entirely).
 
Also the manual says that the "out" tube should go to a BVSV, however mine goes direct to the intake.  Anyone have some comments on the BVSV?  What does it do and is it important?
 
Cheers
Col