I found these that claim they will fit the OG DS.

Having wasted an inordinate amount of time trying to get one that actually fits, this is the exact one I bought a couple months ago that works:

https://www.amazon.com/dp/B00NJPBNUE/ref=cm_sw_r_cp_apa_i_2-owFbNFAV6AX

Notice the rather thin tab at the top, which is what the phat needs, and why others don't fit.