use Innovative steel mounts if you want to go cheaper on the mounts. Anything cheaper than that is not worth buying.

You need to dent the frame rail for alternator clearance on the driver's side, you also need to bang the lip down on the rear crossmember for the rear mount bracket to clear, and remove the front mount flanges from the front crossmember. There are a thousand B16 CRX swap guides on the internet, installing a B18 is no different.