fitting seat edging to cb250n

[Maffoo]

HEy guys, i have a 1981 cb250 that im rebuilding as a bike to get me to tech
I had the seat recovered & have just got the plastics & tank back after painting
When i went to fit the plastic bit that goes around the base of the seat lo & behold i cant get the damn thing to fit .....
ive got some pics so you know what i mean ....

http://i46.photobucket.com/albums/f1...ffoo/seat1.jpg

http://i46.photobucket.com/albums/f1...ffoo/seat2.jpg

http://i46.photobucket.com/albums/f1...ffoo/seat3.jpg

What ive done is in the top shot, ive attached the front screws
the seat doesnt fit in the groove of the fairing, & you cant get the back of the seat far enough down to attach the rear screws, or even the middle ones

in the bottom two pics, ive attached the back screws ... & its even worse , i cant get the mounting holes closer than about 3cm to the base of the seat.
its extremely obvious in the bottom pic...

so, a couple of ideas....
are these particularly difficult to fit usually? is there a secret to it?
ive considered the idea that ive actually been given back the wrong parts ... the seat looks right underneath ... i dont have another seat to compare it to but if i put the seat on the bike without the fairing it fits perfectly, so i dont think its that.. if i put the fairing on the bike without the seat it fits too...
the fairing was part of a group of four.. & all the other parts fit, so i dont think it would be that
it all seemed to fit before from memory... so i dont think they were the wrong parts to begin with... i took some pics of the bike in 'before' stage but none of them came out properly...

so, anyone, any ideas/knowledge you could throw my way would be much appreciatted

btw, heres a sneek peek of the bike, just for you guys

http://i46.photobucket.com/albums/f1...ffoo/seat4.jpg

Oh one more thing ! if any member lives on the north shore of auckland & has one of these, id love to come around & have a look & compare my parts to yours.... the local wreckers doesnt have any i can compare them with... cheers

[Disco Dan]

Has your seat bent in any way since it was re-covered? New vinyl can 'shrink' a tad and bow the seat slightly...

I would take it back to where you got it re-covered, along with the fairing piece and get them to make it fit.

[imdying]

Silly question time... did you get the bike in one piece, are you sure it actually fits that bike?

[Maffoo]

thanks for your replies
It was in one piece when i got it, but how well it fitted, i dont really remember.
if you bend the edges of the seat out, it can be made to fit. this may have been the case & i didnt notice it when i took it apart.
What ive done is given the seat & fairing back to the upholsterer, hes going to clip the corner of the seat to make it fit.
we figured out that its the angle of that corner that is the issue.
what i suspect is that its the wrong seat, like maybe off a slightly different year bike, because all the clips fit (where it attaches to the bike) so it cant be too far off.

cheers
matty