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The Convertible sway bars are larger than the hard top sway bars. If you're replacing the sway bar bushings, be sure to get ones for the convertible. The front sway bar for the convertible is the largest factory sway bar for the E30.

Upgrades using genuine BMW parts
Part	Upgraded part #	Originally used on	Approx. Cost	Benefit	Required Modification
Rear Shock Mount (RSM)	33 52 6 754 096	E46 M3	$20 (x2)	Heavier Duty	None
RSM Reinforcement Plate	51 71 8 413 359	Z3	$15 * 2	Helps distribute load from shock rebound	none
Motor Mounts	11 81 1 132 322	E3,E9,E12,E24,M1	$20 (x2)	Heavier Duty	Remove (grind) alignment nub
Diff bushing	33 17 2 228 425	Z3M Coupe		Stiffer Bushing	None
Diff Cover	33 11 2 228 335	Z3M Coupe	~$200	More cooling fins	None
Aluminum Control Arms	(R) 31 12 1 130 824 (L) 31 12 1 130 823	E30 M3	$200 (x2)	Less unsprung weight and stronger ball joints	None
Control Arm Bushings	31 12 9 061 222	E30 M3	~$75/pair	Additional Caster and more durable	None
Short Shifter	25 11 1 434 148	Z3 1.9L	$50	29% reduction in shift throw	None. Good time to replace bushings
Master Cylinder	34 31 1 156 643	E32	$150-$200	Larger bore, less travel to move same fluid	None.
Steering Rack		E36 M3	$500-600	3 turns lock to lock opposed to 4	Extensive. Not for Airbag equipped cars.
Rear Sway bar	33 55 1 129 194	E30 M3, E30iX, MTechnic		14.5mm opposed to stock 12mm (MTechnic also had 14.5)	Need matching mounts
E-Brake Boot	34 41 2 230 012	E30 M3	$40-$50	Leather instead of plastic accordian style
Guibo	26 11 2 226 527	E34 M5	$100	Thicker,	May need slightly longer bolts

Maybe, need more info:
e28 535i AFM, E28 Master Cylinder, E32 Master Cylinder, E12 tranny mounts

non-BMW parts, upgrades or stock replacements
Part	Upgraded part #	Originally used on	Approx. Cost	Benefit	Required Modification
O2 Sensor	Generic Bosch			Lower cost	Requires reusing stock wiring. With the lower price of the correct part, less people are doing this.