893ST. I haven't done it yet, but its just a matter of time. Titan guys have done this. 
880ST isn't on their website. Are they still in production? As was stated, many different styles will work. The 893 is 37.5 W, the highest that will fit.Gunslinger420 said:The part number I used on my Silverstar driving lights is the 880ST. The plug is straight, no bend.