Use existing image sizes for WooCommerce

I've built a theme and have set the following image dimensions via functions.php:

set_post_thumbnail_size( 1064, 347, true ); // Upload @ 2128(W) x 708(H)
add_image_size( 'standard', 352, 235, true ); // Upload @ 704(W) x 470(H)
add_image_size( 'gallery', 750, 500, true ); // Upload @ 1500(W) x 1000(H)

I use this script to push out 2 versions of the image for retina displays.

I would like to use the image size 'standard' for my catalog images and 'gallery' for the single product image.

Is there a way to disable the WooCommerce image sizes via functions.php and use the ones I have already created?

I've tried customising the image sizes via Settings > Products, but it doesn't work with the retina script I'm using.