Have a old Craftsman snowblower and need to know what electric start will fit it. Bought used, sales slip in book dated 1990, 23" 5 HP trac drive dual stage, says electric start ready. Engine model number is 143.794053. Says electric start kit is 143.88933 which is no longer available. Is there an electric start I can have put on if so what will fit. Small engine shop told me up to me to find something that fits since kit number no longer available. Thanks for any help.