Will this bolt straight into my car, or do I need new hoses?

This radiator uses factory mounting points and tank connections, so it bolts in at the original locations. Check your existing hoses for cracks or leaks before reinstalling — if they're original to your 900/93, replacing them alongside the radiator is a smart move.

Does this come with a new thermostat and gaskets?

The radiator ships as an assembly. Grab a new thermostat, gaskets, and coolant when you do this job — mixing old seals with new parts invites leaks.

Can I reuse my transmission cooler lines, or do I need to swap them?

The cooler line connections on this radiator match the factory spec. If your existing lines are in good condition, they'll work. If they're kinked, cracked, or original to a 91-model car, replacements are cheap insurance against pressure loss.