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http://www.buggydepot.com/product/475/inner-tie-rod-joint-for-twister-hammerhead.html Might ask them for measurements or you might even try your local auto parts store, they might have something close.

My guess is an inner tie rod end. That's what they are called on cars anyways.

To the op, you might try to find some for cars that will have the right pattern, shouldn't be all that expensive. I'm not sure if you will find some but it would be worth a look

You don't EVER polish the intake track, you want to leave a slightly rough or grainy surface. Fuel suspended in the air will stick to the smooth surface instead of bouncing around and mixing with the air more. On the exhaust port you want to polish it to help the exhaust flow better.

Looks to me like some Chinese atv rims.

Look at all the goof cart guys putting snowmobile engines in there cart. Most just run a radiator and no extra pump. Radiators run the coolant through multipul passages at ones, not one tube at a time.