hi which wires go where from the original speakers to my alpine ones as the original spade fitments are the same size where as the alpine ones are one small and one large spade if that makes any sense to anyone cheers

 

Doesn't really matter so long as you do EXACTLY the same on each speaker you fit.

If unsure, fit/wire in pairs, listen to the bass, and try changing over one pair. If that DEcreases the bass, change back, if it INcreases the bass, leave as is.

 

I changed mine not long ago.
One of the wires has a red stripe on it i think that marks the + (check the old speaker for + and - terminals in the block).
Then connect up on the new speaker the standard way.