Please note these bulbs are a technical item and CANNOT be installed by anyone other than a qualified electronics engineer
You obviously are trade if you are buying one of these items as they cannot be used by or be diagnosed by retail clients
Therefore you buy these bulbs on the condition that you have accepted that you are trade and that only the trade can fit them.
And they are NON returnable, you have to decide what size you need if you get it wrong they are non returnable and you will have to buy a replacement yourself
Remember ONLY trade or qualified individuals can fit these and on purchase you have confirmed that you are trade on checkout