Hi,
Here are the details for Starlet GT(135BHP)Map sensor:
12/1989 > 05/1994 - 89420-10020
05/1994 > 01/1996 - 89420-10050
Toyota UK cost for this is £220.20..
I recently went to GS Motors and bought some parts worth 78,000 for my GT..except for Stabilizer bar links luckily TOYOTA lanka had it..they whacked me 3000bucks for 1 link..still I think its worth..since its MY GT after all!!
Here the list which I bought for my GT
-Front n rear KYB hard shocks
-all front lower arm bushes
-Front links
-Front rack ends
-Front ball joints
-All oil seals including Gear box crank etc
-K&N filter standard box
I also achieved better boost after K&N filter..try to get one Rs:9000 bucks and 1,000,000 mile warranty.
So try with GS..u might be lucky too..!!!