Have an 88 at the mockup stage, a 54, so they should be the same.
Features are sort of curved triangular shape, 5 inches wide, clutch cable goes through a tunnel from top to bottom.
2 bolts underneath to bolt to the oil tank platform, and the bracket and breather tube on top.
What you can't see in the pics are the 2 bolts underneath where it bolts to the oil tank platform.
They are exactly 2 inches apart, and 2 inches in from the edge each.
Marked with the 2 (longer) black lines below.
The short line below indicates where the clutch cable tunnel is.
Could get a pic if helpful.
Yell if I can help any, I need to find out much too, and get cracking....https://s11.postimg.org/jvc367877/OT88.jpghttps://s30.postimg.org/yzjo587c1/OT88_2.jpg