Wildcard certificate - multiple sites - one IIS 6.0 server

My setup is as below -

Windows Server 2003 SP1

3 websites running in IIS 6.0
a.domain.com
b.domain.com
c.domain.com

internal IP 1.1.1.1
external ip 2.2.2.2
1-to-1 nat of 2.2.2.2 to 1.1.1.1 by firewall

currently all 3 websites are reachable from outside

What I want to do is enable SSL on all 3 sites. I realize I can do
this by obtaining a wildcard certificate *.domain.com.

questions I have -
1. since there are multiple websites, which one will request for SSL?
(generate CSR)
2. how can I install the certificate on the other 2 websites? do I
create a request from IIS and just import the certificate obtained from
step 1 or do I import/export?

I've installed single SSLs no problem but first time using wildcard and
it is somewhat confusing.

I know with SP1, we can now use a wildcard SLL on multiple websites
using host headers.

Thanks!