TSS is a small company that make up sets. I would contact Tina and if you give her the sizes you want she can make up a engine mount kit ( not sure about the long ones). They do a lot of bolts for the Kawasaki and i know they do the chrome set for the disc's but, because you have a double disc set up the bolts will be longer than the STD.
If you or TSS have problems with sizes contact me for the correct size.