What I would like you to consider at this point, however, is the question of the approval. Certain lamps are permitted on the car is not readily and can thus lead to the loss of warranty of the car. (I can not say with certainty whether these bulbs belong to it, I would be only to remember it) Should an accident occur then etc. is voided insurance. Against the backdrop, it is not worth my fun and I will not spoil these lamps, but rather expensive again, but grab it safe bulbs.
As an electrical hobbyist I however yet another use for the lamp, for which the price then probably goes okay.