How to configure cisco access-list for ports other than well known ports

I am trying to configure an extended access-list
on a cisco 3620 and I am having a difficult time
getting it to work. The thing is that some
application on our server runs on port like 5070
and 5001 etc… when I configure the access-list
as follow.

ip access-list extended FILTER-WAN-IN
permit tcp any xxx.xxx.xx.x eq 5001
or
permit tcp any eq 5001 host xxx.xxx.xx.x eq 5001

neither of the configurations works. However,
when I configure the acl for the well known
ports like 25, 80 and so on it works fine.

what I had to do to get these ports opened is to
configure and inside source static on ethernet
0/0.

My question is; is there another way to
configure an access list for ports that is not
part of the well known list?