Hi. Think you`ll need new nuts plus an adaptor to get a good fit. The centre bore of L322 wheels is larger than that of P38. Nuts & spigot/adaptor rings can both be found on flea-bay, if no-one`s got any spares.
Quick word of advice for a new P38 owner, if you don`t know about it find out about the "EAK". You`ll need yours if ever you have a flat battery to get over alarm system. A main L-R dealer should tell you once you`ve got your correct reg documents.
Anyway welcome to Landyzone.