Chain and sprocket woes

Spoke to several live chat guys on bikebandit.com last march and ordered teh following for my 1980 750LTD

Rear Sprocket - www.bikebandit.com/product/17868
Front Sprocket - www.bikebandit.com/product/17866
Chain - www.bikebandit.com/product/17834

The front sprocket and chain are a match but the rear is not. After talking to him today my bike does not exist as it has 12 digits and not 17.
KZ750H01**** is the VIN.
He finally says this rear sprocket will work.
www.bikebandit.com/product/17868?m=3965&t=1&td=1 The 38 tooth one. Am I on the right track ? I am pissed as my 454LTD is off the road now too and I have a Poker run next weekend. Any advice would be great!

Did you look on z1enterprises site for a comparasion?

No, I haven't heard of that site.

Googled it and found it thanks.
Had a look and I found a rear sprocket that will work for a conversion.

Z1enterprises is a spnonsor of this site. They are in the vendor directory.

You can't beat the service. Roy

They seem to have competitive prices too. Ill call em Monday probably for an order.