Springer front end

[Surfrat28]

Hey everyone! I'm thinking about changing my front end to a springer set up with a 21" spoked wheel with the mini break drum. Is there any suggestions on how to get the springer front end to fit the stock neck of a 1979/80 xs650SG model. Any suggestions would really help! Below is the front end that I am thinking of purchasing.

Springer Fron End:
https://www.ebay.com/itm/NARROW-SPR...m=302545297972&_trksid=p2047675.c100005.m1851