AE2 shares nothing with the sidewinder apart from the case. Same as the HH BRXL. If you want a waterproof BLS esc, perhaps try the tzi world waterproof sidewinder? I believe it is dipped in plastic to keep the water out?
Out of stock, but here's the link
http://www.tziworld.com.au/tziworld/...product_id=111
Kieren