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bash-3.2$ mech-dump --forms "http://www.carzone.ie/usedcars/"
GET http://www.carzone.ie/usedcars/index.cfm [form1]
  fuseaction=search              (hidden readonly)
  MakeID=                        (option disabled) [*/Any Make]
  xMakeID=                       (hidden readonly)

use strict; 
use warnings;
...

$m->form_name("form1")->find_input("MakeID")->force_value("32");
$m->form_name("form1")->dump;

GET http://www.carzone.ie/usedcars/index.cfm [form1]
  fuseaction=search              (hidden readonly)
  MakeID=32                      (option disabled) [:/Any Make|*32]
  xMakeID=32                     (hidden readonly)