ditchyboy

Hi,
I'm looking at changing my bootlid at some point due to a dint after a black bin got blown over in the wind back in the storms plus i like the look of one without the Subaru lettering on.
Anyway when I come to change it how hard is it to swap my lock barrel over?
The other thing that worries me is getting the spoiler (Sti) back on neatly and in line and without leaks as ive heard this can happen.do I silicone around the bolt holes or get rubber washers/seal?or both? If I need a seal/washers can you get them from a dealer or am I best to just get some from a hard wear shop?
Thanks
Michael