I own a Tecumseh 7hp model H70-130158A with a "series 1" carburetor (according to the Tecumseh Service Manual)

I saw few carb kit on ebay
Tecumseh p/n: 31840
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=7712131798

part ?
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=7714890327

a different part #
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=7708250905

tecumseh p/n: 631584 & 631839
http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=7709040149

how can I be sure what I need ?
I've checked specific schematic for my specific model #
Few High-Res pictures...

photo 1
http://wssemw.arinet.com/Scripts/ImgServ.exe/convert?ilFN=D%3A%5CEMPARTweb_52%5CCatalog%20Data% 5CEMP_IMG%5CTEC%5CImages%5CEH70%5C1.TIF&ilSC=100&ilIV=0&ilBR=0&ilIF=G&ilRE=8

photo 2
http://wssemw.arinet.com/Scripts/ImgServ.exe/convert?ilFN=D%3A%5CEMPARTweb_52%5CCatalog%20Data% 5CEMP_IMG%5CTEC%5CImages%5CEH70%5C2.TIF&ilSC=100&ilIV=0&ilBR=0&ilIF=G&ilRE=8

photo 3
http://wssemw.arinet.com/Scripts/ImgServ.exe/convert?ilFN=D%3A%5CEMPARTweb_52%5CCatalog%20Data% 5CEMP_IMG%5CTEC%5CImages%5CEH70%5C3.TIF&ilSC=100&ilIV=0&ilBR=0&ilIF=G&ilRE=8

thanks for the help !

My book shows Tecumseh Carb Kit P/N 31840 is correct.
It lists for $9.95 Check your local small engine repair shops.
They'll most likely have it on the shelf.