Surefire forend for Winchester SXP Defender - any dealers have these in Canada?

[JPainter]

I have done a fan out in the EE, but am not feeling hopeful.

Does anyone know of a dealer who carries a Surefire forend for the Winchester SXP Defender?

Both these models work for the SXP defender and 1300.

636LF
336LM

Thanks in advance if anyone can help.

Cheers,
Jeff