If you need locks for both, you can apply two products.

If you have a large screw head or use some larger diameter screws, then it won't fit. We provide extra screws, so you can try using them instead.

It is not possible to reset the password of the PC Lock(Dial). If you lose your password, you will have to destroy the product, so please be careful not to lose your password. 

ODD Lock can be applied to regular ODDs, but not to slim ODDs(optical unibody) or external ODDs.

Yes. You can apply both of it.

It can be applied to serial ports, often referred to as RS232 ports, 9-pin ports, COM ports, and many other terms, as long as they are the correct size.

To block the module of the GBIC Port itself, use the Fiber Optic Module Lock Plus.
Use a Fiber Optic Port Lock to block the optical cable mounting part at the back of the GBIC port.
To prevent removing the fiber jumper from unauthorized access, use a Fiber Optic Cable Lock(LC).

Fiber Optic Module Lock Plus blocks the module of the GBIC port itself and uses a Universal Lock Key to release it.
Fiber Optic Port Lock is a product that blocks the optical cable mounting part at the back of the GBIC port, and it has 2 different types for LC type, SC type and uses a separate dedicated key.

Simply lift the unlocked lock button section upwards and pull the Lan Cable Lock Plus backwards to release it. 

The lock must be pressed all the way into the lock. You will hear a ‘click’ sound when locked. Please read the manual carefully before use.