Double chainring 42T 48T Bafang BBS01 BBS02

Motor kit provides for a single crown from 48 teeth
AVAILABLE NOW THE DOUBLE CHAINRING INTEGRATED FROM 42 \ 48 TEETH

which allows the use of engine kits to its full potential 'mantenento original derailleur.
thanks to the versatility 'of the double crown and' can use the ebike on climbs more 'rugged and reach
high speed 'road

ALTERNATIVE AND 'POSSIBLE TO BUY THE CROWN SINGLE FROM 42
teeth adapted to a mountain bike use

CROWNS ARE ENTIRELY IN WORK FROM SLAB CNC ERGAL 7075 T6, ANODIZED TO AVOID OXIDE.

TOOTH COMPATIBLE WITH ALL PINIONS MARKETING 1 TO 11 SPEED '

Double chainring assembled in my bike

Does anyone have a link to where you can get more information on this double chain ring for BBS01 and BBS02?

Here is a link to an outfit in France, PreciAlps, for their 42t/48t chainring for a BBS02.

http://precialps.com/uk/accessories-bafang-bbs01-bbs02/42-plateau-double-42-48-dents-bafang-bbs01-bbs02.html