Single clock & King and Queen......

Afto oh wise ones,
Two quick questions.
What years did the single clock T100 run from?
How easy is it to remove a King & Queen seat and fit something else, is it just a like for like bolt on job or do people modify the frame to fit them? ( looking at a bike with one and would prefer the standard seat ).
Thanks and enjoy the weather this week looks like there is another mini heat wave on the way.
Jonesie

 

Thanks Steve.
Has yours got twin dials?
Jonesie peace at last after one of the sprogs just had his mates round for a bbq, what the f*** is all that base about?

 

Think you are correct Steve.
After much Googling it does seem that the Standard Bonnie is a single dial.
So are the T100's the same engine as the base Bonnie?