First of all i don't know why they differniate and varities thier model so much they have diverse trims in 100 series as well as 90 for example same year 100 series vx has double ac but other same trim does not same one comes with wood trim and leather but another same trim comes with normal again one comes with alloy another with steel same trim both vx
So because of this i decided to upgrade my dashboard
So i contacted my parts supplier which is one the best nepal which also supplies to toyota delaer if dealer does not get
Here are parts required for 98-02 to 03-07 dashboard upgrade
Dashboard cost 1300USD
REGISTER Blower No.2 : 170USD
55660-60180
REGISTER Blower No.3: 210usd for both registers no 2 and 3 i prefer wood trim at same cost no change in cost but it depends on your taste buy accordingly to your taste

55670-60120
HVAC HEATER AND AC CONTROL PLEASE BUY RECONDITIONED AS PURCHASING NEW AND ASSEMBLING ALTOGETHER WOULD COST YOU ABOUT 1000 USD OR MORE I BOUGHT 03+ HEATER AND CONTROLS DIAL TYPE AT ONLY ABOUT 135 USD AT EBAY.AU AT FRESH CONDITION
55412-60300 center upper Dvd head type panel OEM:70USD
55845-60110 AND 55846-60090 40 USD EACH THEY ARE AIR DUCT (you have to unut your before air duct and replace with this)You can buy this at partsouq at cheap price i think about 35 40 usd total for both with shipping i didn't because my card was not working for while due to some technical maintanece in bank or something
LEFT SIDE AND RIGHT SIDE HINGE BRACKET CENTER CONSOLE
86207-60010 AND 13usd
86208-60010 13usd
SWITCH WHICH DOES NOT COMES WITH ASSEMBLY PARTS 4.25usd
SWITCH DIFFERENTIAL
84725-60090 5usd please have a look at amayama.com more cheaper
CAP PLASTIC 8465660080
Connector female housing 90980-12170, 90980-11913,90980-11927 This parts were very hard to get but thnx to amayama.com i bought them form thier with cheap shipping fee my parts ship within one day frm JAPAN and arrive at 3 day IN MY COUNTRY NEPAL you can buy replacement part if those not avaliable they would automatically replace
Most importantly great thing is reinfrocement is same as 98-02 even register assy blower no 1 and 4 are same (DRIVER SIDE VENT AND PASSENGER SIDE VENT)
glove box and driver side lower panel also fits same with cigratte lighter panel YOU JUST REPLACE THOSE FROM OLD DASHBOARD TO NEW ONE.
After everything main obstacle here is wiring of HVAC
SO I AM WORKING ON IT AND MY MORE PARTS ARE ARRIVING I WOULD KEEP UPDATING THIS POST AS I PROGRESS
Note:Content may be not fully correct and may be suject to change in future thnx
Heare are some photos