There are some advantages in spending a little more to buy a Real Comet compared to a clone.
Both work, but the OEM parts are a bit better, I use a mixture of OEM and clone parts.
Advice is like a bum hole and everyone has one.
If you have a stock 6.5hp or less buy this part and swap out the stock 10 tooth on your TAV.
5/8" Bore C Type Sprocket 40/41 chain
I recommend you support our host here, but any place that sells sprockets can get you this part.
If you want a larger rear sprocket Azusa has a hobler and can make anything you like in aluminum.
These are very easy to drill your mounting holes in ( I use the 58 and used the even tooth number to draw my drill pattern guide lines ).
Odds are your crank will be shorter than your clutch, buy one of these unless included in your kit( ask seller, I think OEM includes this but most clones do not )
5/16" Steel Washer for Torq-A-Verter - 200840A 5/16" ID PILOT WASHER TAV2-75