All the 8xx bulbs are the same base, just different wattage if I remember correctly. 893 is 32.7w or something and the other ones are mostly 25w IIRC.
So in reference to your original question about getting HIDs, you don't need to get specifically an 893 kit, you could get an 880, 899, etc. kit as they are all the same base.
2001 Ford Focus SE, Black - R.I.P.
2001 Ford Focus ZTS, Silver - Hella Dual-Projector Headlamps Painted, Morimoto 5000k 35w H9 kit, eBay CAI