You need a C5 BW1350 shifter, and a 1986-1987 shift arm from a BW1350 manual that was behind a FM145 manual transmission. It’s the same length as the shift arm on the 1983-1985 C5/TK4/TK5/FM145 fixed shift arm 1350 but is removable. The BW1354 shift arm is the same length as a FM146/A4LD BW1350 shift arm.

1983-1985 fixed arm BW1350:

A4LD/FM146 BW1350 shift arm vs shorter trans shift arm.

Long BW1350 vs BW1354 arm.

BW1354 arm

C5/TK4 BW1350 shifter

 

1986-1987 FM145 BW1354 arm

 

Short arm on BW1354 with C5 BW1350 shifter low range.

 

Short arm on BW1354 with C5 BW1350 shifter 2Hi.