Gary I've been using replacement festoons for 2.5 years and they are working well.
Regarding the contacts, if the bulb is slightly smaller I would just pinch the springs together slightly to make it a tighter fit, been working for me for a couple years now.
Or you could try any of the solutions such as these on ebay for half the price of Bimmian (way overpriced IMO)
Kaibird 18x White LED License Plate Lamp Light BMW E53 x5 1999 2003 Pre Facelift | eBay
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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards
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