Here is my old Steeda short shifter how to. Same idea for the B&M just skip the parts about the riser plate.
edit: this is for cars with the small plate
its really not a hard install. took me about 30-40 min max and i didnt have instructions. here is a brief overview:
1. remove the shift knob, reverse lock out, and shift boot.
2. remove the center console.
3. using a flat head screwdriver, pry off the shift linkage on the right hand side of the tower. dont pry on the whole thing, just try to pop loose the little center section. when you get in there you will see what im talking about.
4. remove the 4 screws that hold the shift tower on.
5. pry off the shift linkage on the bottom.
6. slide the shift lever out of the housing. the shift ball will be covered in a rubber thing with two plastic halves covering the ball in the rubber. again, when you see it you will know what im talking about.
7. take that rubber sheild off of the top half of the plastic on the inside and slide that plastic half off of the shifter.
8. remove the bottom half of that plastic sheild (i just left the rubber cover on it as opposed to taking it off)
9. grease up the main ball on the shifter (use lots). the grease is uber sticky and messy. i didnt wear gloves and it takes lots and lots of paper towels to get off. also go ahead and dab some grease on the shift linkages
10. put the top half of that plastic piece you just removed on the new shifter.
11. put the bottom half and rubber cover back on stretch that rubber cover back over the top half.
12. i removed the centering spring. one, i like it without it and two, it looked like a major [censored] to notch the tower. if you need to notch the tower, when you put everything back, you will see on the right hand side where the spring hits. its covered in a little rubber coating.
to remove the spring:
a. take off the c clip on the end of the pin that the spring is attached to (right behind the elbow on the right hand side shift linkage).
b. pull off the elbow (dont lose the washer under the carpet like me! i had to find a new one). c. remove the spring and put the elbow, washers, and clip back on.
13. insert your spacer in between the bottom of the shift tower.
14. slide the top half of the shifter back through the top piece of the shift tower.
15. work the bottom half of the shifter back through the bottom.
note: it may be kinda tricky to get the covered shifter ball back in the top half of the tower but once you do everything should fall into place
16. with your new bolts, start bolting everything back down.
17. reconnect the side and bottom shift linkages
18. put the center console back in
19. attach the shift boot to the new reverse lock out
20. slide the two rubber o rings onto the shifter and position them in their groves.
21. slide the reverse lock out back on the shifter (the flat side goes in back) and line the slot in the reverse lock out up with the hole in the side of the shifter.
22. insert the pin into the hole. it will take a little persuasion (sp?) but just bang it in, it will go
22. re-attach the shift boot to the console
23. put the spring from under the shift konb back on top of the new reverse lock out
24. screw the shift knob back on
25. enjoy your new shifter.
this was just a quick write up so if i forgot something, let me know. hope this helps.
also, if you cant find the bolts anywhere, let me know. i would be willing to go buy you some, if you cant get them anywhere else. i just called around to some hardware stores and found some.