Festoon bulbs to match Philips W5W's?

One of the interior W5W bulbs above the RV Mirror went this weekend and I had a set of Philips Bluevision W5W bulbs sat in the garage (they were free with a set of original Bluevision headlight bulbs - not the newer Bluevision Ultra - for my previous car) so I replaced them both with these.

They look much better than standard W5W filament bulbs and not as harsh or as blue as many LED bulbs (I've got one in the rear at the mo and I hate it!)

Does anyone know if there is a matching festoon bulb for these?

I believe that they are 3400k (but they could be 4000k - I don't have the original packaging anymore to be able to check).

There are probably LED's that are brighter (which would be good in the back) but I'd like to try and even up the front with matching colour temps at least.

Anyone? - I can't find any after about 45mins on Google (I can at 4000k - Philips Vision LED festoon ones are £14.99 each and a pair of matching LED W5W's are £19.99! Yikes!)