UUC's kits are quite specific especially with the DSSR length. If you are interested I can help you check with UUC's Rob Levinson on whether my kit will fit your car. PM me the info below.
You're asking for a E36 right? Ori manual or converted? If it's ori then easier to check just need the year and last 7 digit of your VIN. Also if it's CKD then harder to check cause CKD vin isn't registered in sites like realoem.com.
On the left column there is a drop down menu with a "Start Here". Click on it and select Shortshifter Kits.
The thing is my kit is meant for a Getrag gearbox so I don't think it'll fit the E36 M3 3.0 as they came with ZF gearboxes. I checked my old email with UUC and they confirmed that the dimensions of the shifter itself is different between 325 and 328 (The M3 3.0 ZF is either same or had a similar body with the 328 I believe as they're listed under the same part in UUC).