Need to find out which type of radial shaft seal I have

I am repairing the coilover of a Yamaha XT600 2kf and I need to replace a radial shaft seal. Unfortunately I have not been able to identify the exact type of seal this is. I have only been able to find the standard ones like this:

These are some images of the one I have:

http://imgur.com/a/uzTWt

As you can see a standard radial shaft seal will not fit. I would like to know what this type of seal is called and where I can find them.
Thanks in advance.

Update:


These measurements correspond to the markings on the seal. The markings are :BJ-14 25 7-25. Searching for the markings on google did not lead to any useful results.