Hello, I currently have a sc6 comp kit in stock mid motor configuration. We run on turf, what do I need to convert to either a 3 gear stand up transmission or the laydown transmission from the 6.6? For the laydown, I see they sell parts um736, um737, um738, um739 and um740. Do I need them all or can I use my stock bulkheads and just order the laydown case, idle gear, motor plate, and the gear cover? Thanks in advance.