Both my sets of Yamiya pipes fits very well.
No numbers and Lotus Root.
They might need to sit all the way in at front spigot to fit the rear frame hole.
They can glide off a little. Only thing then is to swing the pipe down a little at rear and push at the front to let it glide on the spigot again.
Absolutely no hammer time needed.
I have used a luggage strap around the entire engine with pipes on to make them sit correctly until I fasten at rear with foot peg.
I used motor oil diluted with white spirit to give them a splash of rust protection inside.
My garage is very dry, heated and never below 21*C.
The Yen is cheaper now than several years back. This despite the cheap Swedish peseta.
Latest rate from yesterday. Update every working day 1pm.