Are these centre sections on ebay alright? plus cat question

[Dcds4]

Thinking of putting the standard zorst back on the motor, still got an old backbox lying around so was wondering if this dirt cheap centre box on ebay would be ok? Looks differnt to original...

 

[edde]

Link?

 

[Dcds4]

haha forgot that....

http://cgi.ebay.co.uk/HRNS118CP-EXH...ryZ10410QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[Dcds4]

can anyone tell by looking if this is the ph1 or h2 length as i heard they are diffferent?