i did look into it with s13 screen, but, i was waiting on an owner that had access to both screens to do a comparison, but they just didnt have the time to check this for us (i know how he feels tbh
)
i had an s12 one put in cost me £160 fitted
http://www.nissansilvia.co.uk/vbb/showthread.php?t=2631
this has the part numbers from budget windscreens, they do fitting all over the country, mine was rusty at the bottom of the screen, the fitter just filled it with the sealant, and told me that should be more or less just as strong.