hey anyone  know where i can find an ext cable for my rear 02 sensor ????

You need TXL 18 gauge wire or good quality automotive wire.

Just found this while reading through the EFI section (Page 10) that was posted by Ozroder (R.I.P) which will hopefully help you.

http://namzcustomcycleproducts.com/products/O2_sensor_extension_kits.html

 thx for the link thats a different set up to mine