Hi insydney, welcome to Outdoorking.
I don't know what brand of carburetor you've found for sale on ebay. I do know that some of the copy-carburetors made in China for the GXV160 and its copies seem to be of quite decent quality, and their parts are interchangeable with the Keihin that Honda uses.
If you want to get your mower working quickly, you might find it worthwhile to buy a copy-carburetor, and also clean the original one as a spare. It is quite unlikely that you will need to replace the insulation block: those are not normally affected by changing carburetors and gaskets, as long as you recognise that they are plastic parts and treat them accordingly. The insulators and its gaskets are interchangeable with Honda ones, and I use Honda ones myself just because they are good quality and easy to get from my local dealer. However you may be able to get copy ones cheaper on ebay. Just by gaskets for a GXV160, don't expect to find someone selling parts for your particular copy-engine. You may not need to replace the insulator gaskets: some of them stick, and therefore have their flat surfaces torn when you remove them, and others don't stick, and can be reused after careful inspection.
Please come back to this thread and keep us posted on your repairs. We are happy to help.
