Thanks for your advices. The problem is that this lens has a fixed lens hood so you can't use a standard cap. Panasonic does not deal directly with private customers so I must get my dealer to contact them. First time ever I lost a lens cap and it was this one. I have contacted the dealer!
Yes, I'm aware that the 7-14 requires a different lens cap because of the design, that's why I mentioned after market
push on lens cap. It's not an entirely unique design as other lenses in the past have used push on lens caps.
Still, if your dealer can get one from Panasonic directly, that would be the best. Time to consider a lens cap tether if it becomes really problematic!