I have a pair of spare silver bulbs if anyone is interested?
I bought 2 pairs, but picked up one of the wrong ones.
There are two types. The pins are offset, and others the pins are opposite each other.

I have a pair of opened but never used Silver indicator bulbs where pins are opposite.
(usually used for front indicators, but some rear light clusters use these. most rear light cluster have offset pins, so check before replying.)

Looking for £5.50 inc postage. Paypal easiest option.