In case someone is contemplating HID conversion for their KLR, it might be useful to note the two main bulb types.
The larger bulb with the black plastic bulb on the bottom has a fixed hood or shield over the bulb envelop. The hood/shield has a slot which is covered by a shutter for low beam. The bulb on the bottom houses the solenoid which operates the shutter. IME, this is the more robust bulb design although would appreciate any experience reports, particularly of the contrary.
One problem with this style is that the solenoid housing is too large to fit into the rubber sealing boot/cover so the boot must be slit and resealed.
Another problem is for applications such as the KLR which uses a circumferential retainer ring which cannot pass over the solenoid bulb.
The smaller bulb without the lower housing or the integral H4 adapter plate is the other common bulb type. This type provides high and low beams by shifting the glass envelop through a small arc provided by a small solenoid in the base. While these are not so robust, IME, the smaller base allows many sealing boots to be installed which simplifies installation.
This particular bulb type also does not have an integral bulb adapter plate and uses one of four mountings. The bulb adapts to housings such as some of the small Honda enclosures such as for some CT110, without an adapter plate. The kits generally come with three adapter plates, H4, Honda, and ...can't recall the application. I'm finding an increasing number of "can't recall the application" parts out there...
Perhaps this is useful to someone.