The actual kit ID doesn't matter, and the name doesn't need to contain the kit ID. You can make the <kitName> e.g. my_modkit_whatever and it doesn't need to have a number in it at all. So just edit the <id value="whatever"> to an available modkit if you have a conflict.
Hello all,
I have created a mod kit ID registry so people can register which modkit IDs they are using for mods they plan to release publicly, to avoid accidentally using a modkit ID already in use by another mod. This will make it easier for modders to make sure their mods are widely compatible, and less likely to create support requests from users.
The registry is available here, and can be publicly edited at the moment: https://docs.google.com/spreadsheets/d/154RLDnK35cNUPZrIiEep5ymy9UlQ-jpsx1XJxiJ9-Qw/edit?usp=sharing
Please feel free to add mod kit IDs you are using, or that you know are in use by mods you've downloaded. If someone wanted to go through some of the more popular released mods that use modkits and add them in, that would be a great help.
Obviously this is an entirely voluntary effort for modders to all make life easier for each other. Nobody's going to come after you or fight over IDs, I just want to make things go smoother 
Already possible, Just use a trainer to set the component you want on a ped that has a bullet proof vest component, and set the armor level to max.
Finally! 
Request fulfilled after only 1 year! 
There is a limit of 256 entries in vehiclemodelsets.meta. It sounds like you're over that limit, which will cause it to pick the wrong entry sometimes.
@Unknown-Modder I suppose the issue people have is that the description explains what it literally does, but not what that means to the average non-technical user. Which is a fair criticism of the description I suppose.
Because the mod is extremely useful and not well known. I agree that the author of the mod isn't doing a good job of engaging with the community about it, but it isn't featured as an honor or benefit to the mod creator, it's featured for the benefit to the community of being aware of what the mod does.
@Blocks925 just replace the texture with an all black texture. Bam, done!
Yeah it's pretty annoying that flags are just there tantalizing us but boat collisions don't work. Oleg did acknowledge the issue finally and said he'll look into it. Hopefully we'll get a fix soon.