My pomen said that Daihatsu designed G100 for the year 2000 market..Look at the design and compare with other car that produced during 1987-1990..Like Honda Mayat, still kotak design although it was produced in 1988..Look at Iswara which was produced in 1991..Kotak as well! Daihatsu designed the bulat car in 1987 that the design can last till now..
For the spare part, you can still find it at hakat..Or you got to stick at Charade Otais' workshop..They can find it for you cz they have a good contact with hakat's tokey..They can even order from Japan through that tokey..
My suggestion is, don't sell you car because when you convert to GTTi, you will feel the satisfaction of true Turbo engine..Don't have enough money? Apply for personal financing and pay back. Sell your handphone, PDA or laptop. Do a part time job or over time...If you wait till 2 years from now, I'm affraid that the price of hakat will rise..Upah fee still same..So, do it now! :D