Can you not still get the Koni's for the Sud?
try Koni UK, give them a call rather than just take the website word for it, as they list the 33 and Sprint, and they are a recognised improvement over stock, very popular choice indeed if you can get them.
as for tyres, as above really, although i think you can make an educated selection if you know what you want from your tyres?
millions of miles and less grip, or less miles but loads of grip?
the choices will be endless, and on both subjects, it may be worth you looking up Kevjtd on here, a very experienced sud owner/restorer, and worked in the tyre trade until very recently for the best part of twenty years i think.