Can I install Drifter VN800 Soloseat to Drifter VN1500 because I don't like a original Drifter 1500 seat.
My Drifter 1500 is 2000 model and new seat is 1999 model
There is a pic a new Drifter 800 soloseat:
http://aijaa.com/EelBIJ
No. Not without a lot of work (IMHO). The front mount of a 1500 is a bolt with a large suspended washer (bit like a common mushroom in full bloom) which the plastic belly pan of a single Corbin/or Kawasaki double slips into.
You might get away with screwing your front bolt in and then re-attaching it to the seat with the hex nut, BUT looking at that linked photo, you would have to make a different bracket to line up with the rear bolts - much further back towards the rear of the m/c.
The Solo seat came out in 2001 as a limited edition leather tan Corbin or a black vinyl Kawasaki. The Tan Corbin is rarer than Gold hen's teeth - I have one :D. You may get an OEM Kawasaki one (try RonAyers website), or do a search on this Forum (Mods & accessories) and see the after market ones other members have used/modified.
???
As already posted by Drifter-paul, the 800 seat doesn't fit the 1500, unless you're ready to face a hard work to fix it...
1500 & 800 are similar just on the front side. All the rest is quite different.
BTW, what kind of seat is that? I've never seen one...