I think Vucevic would be a really good fit for the Lakers, he's far from what AD can offer defensively, but Vucevic is an offensively awesome center piece, he can score easily inside the paint and he's also got really great numbers from behind the arc as well.
Jakob Poeltl is also a good choice, but Steven Adams as it is now doesn't seem like a good first choice center to me, not because of his ability but that of his health concerns, I'm not sure Steven Adams can handle big minutes anymore let alone back to back games when the situation requires it, the Lakers might need whoever they have on their roster to be available for the final stretch of the season, if they're to make a run for a possible post season campaign.
None of them looks like it would be a "good" one for them, sure they need a centre there is no doubt about that, losing AD was a big miss for them even though they got Luka, it's clear that they are very short now. I mean at this point they are about to ask Lebron to start playing centre lol, so they surely need a new one. But they can't get a good one, those listed aren't really that good, maybe Vucevic could be a bit decent, but most of them are just mediocre players.
The gap that AD left at bigs will not be closed that much is known and obvious, and without a big, they are going to have a glaring issue when it comes to defense, and specially rebounding as well. If I were them, I would stop looking for anyone good, and just get someone who is athletic and tall, so they can focus on rebounding.