1990 k10 March 1L 4-speed swap to wide ratio 5-speed

Hi,

I live in the US (New York) and just had a 1L 4 speed k10 March imported from Japan. Its pristine, runs beautifully and only has 55k on the clock, but I would love to switch to a 5-speed wide ratio for better mpg on the highway, only problem is parts are non-existent in the US. Anyone here know where I can find a 5-speed wide ratio online that can ship to the US? budget is around 1000 including shipping. Any help is super appreciated. Thanks!
 
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