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Probably. I buy them in job lots from eBay and carry them in my toolbox. There used to be a UK manufacturer selling them.
Mr_Sworld is right though, best way forward these days is taking out the transformers, fitting GU10 connectors and GU10 leds. It has been a while coming but the quality is there at a reasonable price now.
When I have a customer with a faulty 12v halogen I don't like to be that guy who suggests replacing all the bulbs is the only way forward though!
Even the integrated downlighters are well worth consideration. Some have incredibly low profiles which means you can fit them where you couldn't have before. Then there's led strip which gives massive possibilities.
This appears to be my problem. Will better connectors likely help?