Petrol Gearbox Parts on Diesel Bell housing ?

[mig]

Purchased a bare diesel bell housing for a petrol to diesel conversion.The seller assured me everything from the petrol bell housing would swap over,however Aidan advises that the clutch slave bracket and the lever arm on the end of the clutch fork are petrol or diesel specific.
Has anyone fitted the petrol bracket and lever arm to a diesel? Any problems doing that?
Thanks

[mig]

O.k Just in case anyone else has the same question,
No the petrol parts won't fit.
You need the diesel specific parts

251 141 713 C is the arm
251 721 281 B the slave bracket and
251 721 259 A the slave bracket strut

Thanks to Aidan for the info.