ive got the 748/916 front end on the nc 30, my question is, can i replace the existing bearings with the tapered roller bearings? and where can i buy them besides ebay? thanks all!

original part no: 702.4.004.1A and also 702.4.123.1A

I've got this front end as well...

Maybe you guys would be so kind to advise the length of the two different forks? Then I could add it to the database.
http://www.litetek.co/Guide_USD_ForkDatabase.html
Distance is axle centre to top of fork tube (not cap) when fully extended. Pics would be great but some information is better than nothing.
cheers
Blair