E30 had different style of female receivers over the years. Both will work with male buckles that had smooth latch plates (later models). E30 female receivers are not compatible with original 2002 male buckles, but 2002 Repa female receivers are compatible with late E30 (smooth plate) male buckles. You can find used E30 parts on eBay, with matching male and female buckles. It is then a matter of installing E30 male buckles on 2002 belts, and matching E30 female receivers on the E30 seats if you don't have them on seats already. Or, you can contact me via PM if you want my help. It is not a free service.