Honda GX50 QXA and QHA

[Irish John]

Can someone please tell me if the Honda GX50 QXA is the right motor for a frame-mounted grubee GB or should I be ordering the QHA? Is there a difference and, if so, what is it?
Lastly will all grubee GBs fit the Hondas mentioned above or do I need to ask for anything from the Bicycle-Engines.com?

 

[HoughMade]

I used the QHA- this one:
http://www.smallenginewarehouse.com...+Horizontal+5+8+x+1+1+4+Shaft+Muffler+no+tank

I know it will work. Can't say that the QXA would not, work, however.