I need to replace the BB in the early 90's Pinarello Veneto that I am rebuilding. It has a 36x24 f BB now, and is very sticky. I am putting on a mid-80's Shimano 600 group set, and need a square-taper Italian threaded BB to match. Does anyone know which is best?

I'm thinking of getting a Shimano UN55 one, but don't know if it will be Italian threaded or not.

Can anyone can send a link to where I can buy the right BB, or know if the link above is the right one?

Thanks!