That I don't know unfortunately. I used a TRX third gear, straight swap over to my mk2a 8fiddly. You might find your answer by looking up the parts numbers of the 1st gear/axles.
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If I were you, I'd swap your mk1 gearbox over for a mk2a gearbox, if you can get one at the right price. Very similar ratios and it's a better quality gearbox. It's also easier swapping over complete boxes, than swapping bits of 'em over.
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If I were you, I'd swap your mk1 gearbox over for a mk2a gearbox, if you can get one at the right price. Very similar ratios and it's a better quality gearbox. It's also easier swapping over complete boxes, than swapping bits of 'em over.