- $32.00The Telegraph in America, 1832–1920 (Johns Hopkins Studies in the History of Technology)Amazon
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- $19.50and upHopkins Towing Solutions 41125 Plug-In Simple Vehicle Wiring KitAmazon & 1 more
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- $23.99and upEndurance™ Flex 7-Pin to 4-Pin Trailer Light AdapterWest Marine & 2 more
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- $9.18and upHopkins Manufacturing 6 Round Metal Car Side ConnectorCamping World & 2 more
- $34.99Hopkins 6 Round to 4 Flat Multi-Tow AdapterAce Hardware
- $25.49and upLED Submersible Low-Profile RH Combination Trailer LightWest Marine & 1 more
- $11.04and up12" Endurance™ Easy-Pull™ LED Test 4 Flat ExtensionWest Marine & 2 more
- $3.37and upHopkins Endurance Easy-pull 4 Flat Extension (24") in Black | 47004Lowe's & 2 more
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