This comes up regularly and doesnt produce much if i remember.
Before you commit to using the original stress test the connectors on the back of the box. If there is corrosion there then there will be problems.
Some including myself have fitted one of these.
The 6 way is £7 odd plus post and nearly fits in the original location.
Fuses available anywhere.
It has a rubber sealed lid too.
From
http://www.vehicle-wiring-products.eu/V ... lders1.php
AL