I just do a google search for injectors and the vehicle. I found the injectors for your 1.6 corolla here:
http://www.witchhunter.com/flowdatapix/d2325016150.jpg
I know that your 1.6L Corolla injectors have a denso connector with a two-hole split type spray pattern and can probably benefit from a newer 4-hole type. Some ebay auctions have pictures of the injector tips. Injector wherehouse or ebay is where I've purchased injectors in the past. Hope this helps.