Hello Evette,
You can get the springs from most sewing machine retailers, it does not have to be a Toyota spring, lots of springs fit lots of models, ideally if you can take the spring out which is quite simple and take it to a sewing machine shop if you have one near you and match it up, or if you can take a photo of it and e-mail it to www.tandtrepair.com he may be able to match it with a Singer or www.sewingonline.co.uk/instructions and do the same.
drivewithken@blueyonder.co.uk
Ken
drivewithken@blueyonder.co.uk, February 2008