Simoco SRM9000 series mobiles (they only make remote head with 3 different HHCH options)...hell, a SDM600 series would work as P25 is not needed.
GME Australia has a micro-mobile in the works. Though it is P25 capable, it's tiny and available in either a basic HHCH (reference the Simoco SDM610 and SRM9010) or a dash mount.
I've got a Astro Spectra (100W) with a W3 in my pickup. The antenna is a Panorama Shakree with a triband (145-174/430-480/764-895 MHz) whip but pictured is the nitol VHF 1/4 wave whip because I've never gotten around to putting a picture of the trident on photobucket. Oh, the W3 is mounted on a Panavise InDash mount...
Kenwood makes a HHCH for the NX line. Hytera has a HHCH if I remember correctly. Tait may have one...