71 25 hp Sportster electric start

Hi all
I have an old 71 Sportster, that Im considering updating.
In the service manual it shows an electric start system..
As mine is a pull start, I would like to retro fit electric start, with a charging system??
Can this be done using after market componants? if so where would I purchase them from?.
Thanks All
George M

Thanks Twinkle
I still need to contact them for the control cables will give them a call soonest..
( Need to collect all my beer tokens first ) lol!!
George M