Radio change - 1997. Amps & wiring color questions

Hello,
I'm attempting to change the radio in my 1997 HiAce Super Custom for a Sony so I can get Bluetooth and all the radio stations without an expander. The expander gets all the stations, but with less intensity, so they have too much static.

When I pulled out the Radio there is one plug connected into the back with two rows of wires (see photo):
row 1: white, green, black,red,black,green,white
row 2: yellow, blue, red,brown,brown,blank,blank,green
Can anyone tell me what they connect to?

I've heard of harness adaptors for radios from Toyota to ISO standard. Does anyone know where I can get one for my Super Custom?

I thought the super custom would have an Amp. I found one above the glove box. Part number 86280-26090. There are a lot of speakers in the Supercustom, so I suspect there are more Amps. Does anyone know how many & where they are?

I've tried posting some photo's of the amp, radio and plug with this post, but I may have failed.

Mal

I got a harness adaptor from Amazon

Thank you Tony,
I couldn't find it on Amazon, but during the search I found a company that might have one. I'll see what they come back with