Lost my seat bolts to my 2003 yamaha r1 does anyone know the size of the bolts that hold the seat down?
With no direct knowledge of the exact size I can hazard a guess that they are allen head 6mm x 1.0mm pitch, and a length of 20mm to 25mm or so. It is unlikely to be any more as the load is minimal. What size allen (hex) key did it take to remove them? If it's a 5mm, the probability is they are 6mm bolts.
If it has already been done, it is safe to assume it is possible to do it.
On the other hand, if it has not been done never assume it is impossible to do it.
------- Rob --------