BBS Metal Tyre valves - replacement?

[Andy T 0]

I have 16" BBS RC'S which have the original BBS metal valves.

 

I'm having some problems with tyre pressures at the moment, two wheels are going flat but at random rates.

 

Does anyone know, can you replace the cores on these valves?

 

If not, any tips on valve replacement? all I've found so far is justmatz.co.uk, they say I have to measure the hole in the rim to see if it matches the bbs ones they sell.

 

Thanks,

[subcool 0]

try phoning bbs in germany they speak english and were very helpful for me once...