12v Electrics

Hi
Can someone please advise the best 6v to 12v conversion kit for my Li150/200 Series 2 have been told SIL but not seen one personally so would love some advice
Thanks chaps
Can someone please advise the best 6v to 12v conversion kit for my Li150/200 Series 2 have been told SIL but not seen one personally so would love some advice
Thanks chaps