I hate to cough up an old thread but maybe the correct SKU numbers for the parts will help someone looking for the tensioner.
Baja Motorsports Chain Tensioner Assembly
SKU 551023899 $9.98
Baja Motorsports Spring Tensioner
SKU 551025499 $2.98
As misteright says, the #551025499 Spring is really a little too light to apply correct tension. Any torsion spring that's a little heavier will do the job a little better. Depending on your mounting method, you might need a slightly longer leg on one end or the other of the spring.
Be very careful with the part name and number. I drove to another store to get the tensioner and when I got there they only had the spring. It might be worth it to go ahead and get the spring to have a pattern to bend a heavier spring to fit.
The
TSC website shows the parts available online or in-store.
Good luck
Ted