you need also 4x
BM 8175003
https://www.fmw-tuning.de/bmw/3er-e36/e36-carstyling/e36-bmw-original-parts/blind-rivet-nut-m8-bmw-3er-e36-convertible.html
fit for
3er E36 Convertible
318i (BH31/M43), 318i (BH41/M43), 320i (BJ11/M50), 320i (BJ21/M50), 320i (BJ31/M52), 320i (BJ41/M52), 323i (BJ71/M52), 323i (BJ81/M52), 325i (BJ51/M50), 325i (BJ61/M50), 328i (BK71/M52), 328i (BK81/M52), M3 (BJ91/S50), M3 3.2 (BK91/S50)
Z3 E36 Roadster
Z3 1.8 (CJ11/M43), Z3 1.9 (Countryman11/M43), Z3 1.9 (CH71/M44), Z3 2.0 (CL31/M52), Z3 2.2i (CN11/M54), Z3 2.8 (CH31/M52), Z3 2.8 (CJ31/M52), Z3 3.0i (CN51/M54), Z3 M3.2 (CK91/S50), Z3 M3.2 (CL91/S54)
Z3 E36 Coupé
Z3 2.8 (CK31/M52), Z3 2.8 (CK51/M52), Z3 3.0i (CK71/M54), Z3 M3.2 (Countryman91/S50), Z3 M3.2 (CN91/S54)
original BMW part