anyone know what fixings are used to attach the hard top on a mk2 rossa mine came with a hardtop but no bolts?

There are supposed to be Jacknuts in the places marked for them around the bulkhead and on the top windscreen rail. I think they're something like 6mm but I haven't checked. However, these are hard to come by (I've only ever seen them once) and they're £1 each. Also, they require a fitting tool which I've never seen. The more modern alternative is Rivnuts which you'll find on good old ebay along with a variety of fitting tools.

Second the use of rivinuts, mine had had the jacknuts fitted and some of them were loose, now all replaced.

Allen