Are your old speakers shot like mine were
so follow the guide on here for removing the door card
picture of how shot they were
So unscrew the speaker holders from door and pull forwards enough to get to the wires behind and pull them off..
now you have to get the old speaker out.. I have seen them fitted slightly different than mine so heres a guide if yours are the same as mine.
first find the three bent lugs that go into the holder
now you need to get a flat screw driver that will fit in the slot so you can bend them straight
o.k now you have all three tabs bent straight you are almost ready to pry the speakers out but because they are glued in you will need a hairbdryer that gets nice and hot... (this in itself most would find funny if the saw my hair lol)
so heat around the edge
get a flat head screwdriver and use as lever after heating for a while
and it should start coming away easy if you get it hot enough.
the speakers that fit the mark 1 F are 6. 1/2 in I went for the FLI Fi6 as I thought they had a good all round sound with enough bass.
so now put your new speaker into the holder.. you could re-glue them in with a hot glue gun or screw them into position (note make sure the speaker is in the right position to get to the connectors behind) I screwed mine because i couldnt find my glue gun.. might glue them when it reappears.
if screwing them pre drill the holes into casing with a smaller drill than the screw your using..
heres my speaker fitted.. now just put everything back together