Lockable cover for water tank for Trident

Unfortunately the original water tank cover for my R Reg Trident has been lost (fallen off) and the replacement(s) just are not secure, they come with tiny little plastic bits that don't hold the cover in place.  Apart from taping the cover on in transit are there any other suggestions to make it secure please? I could post a photo but no idea how to!!!

Do you mean the lockable cap for the filler inlet? If not, I'm struggling to think what you mean!

If the cap, it may be possible to buy a replacement that fits - A/S often used Fiamma and they still make them. However... unfortunately they changed the design regularly, so you may find that the whole filler has to be replaced (that's what we had to do a couple of months ago on our 2005 Trooper, because there was no key when we bought the van).

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