Go to www.servicehonda.com and search for the part numbers of what you need. Once you have a number a simple search will reveal options through eBay I'm sure. The throttle cable should be available through Motion Pro or someone like that. The shifter will be easy to find as it's not a highly wearable item.
Trikes
1970/71 US 90 (Aquarius Blue)
1970/71 US 90 (Future Project)
1972/73 US 90 Camo Project (110 Big Bore)
1972/73 US 90 Green
1977 ATC 90 w/83 110 motor (Fugly)
1982 ATC 70
1983 ATC 70 (Ladybug)
1973 ATC 70
1965 Marketeer 3 Wheel Golf Cart with 1986 Honda 250 drivetrain
TF 2015
Other
1983 Honda Z50
1978 Honda XL75
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