How to download best 16:9 MAME games themes?

[TheManuel]

Helllo. 

 I've been trying to update my setup and was wondering what is the easiest way to download the best 16:9 MAME game themes.
Is it a manual process to search for and download each games or is there a curated collection somewhere that can just be downloaded at once?

Thanks!

[TheManuel]

I had downloaded the "4,006 MAME Thems" pack from the supporter section thinking they would be 16:9 but they don't seem to be.

Is that considered the best pack available?