I am interested in buying one or two keyless remote controllers for a '94 540. I don't what controllers from other E34s would be compatable, but my controller part no. is: 88 88 1 600 292. The circuitry in both of my controllers is working fine, but the cases are breaking and I have lost the code chip from one. I now have new chips, but am determined to get a new case before using the damaged controller again.