Finally after reading the holster config I found an easy way to make this work on LSPDFR 0.4.9. In police locker you have to open customization and then select the same component - drawable items that are set in the holster xml. The model is "MP_M_FREEMODE_01" for male and "MP_F_FREEMODE_01" for female.
By default it is for example:
<Model>MP_M_FREEMODE_01</Model>
<Component>7</Component>
<Drawable>6</Drawable>
You can use these numbers ingame and it will work. But the downside is that there won't be a visible holster. To fix this, go into police locker and browse through the component drawables until you find a holster you like to use. Now set the related number in the holster xml file.
For example, if you holster is on drawable 95, you put 95 into the holster xml below your model.
Like this: <Drawable>95</Drawable>
Now save it and then reload all plugins. Go on duty - police locker - select the same component again and you're good to go.