[johnsjmc]

I've been doing some reading on Rennlist about this setup. It appears that the 1989 and earlier G50 flywheel is a lightweight single mass design already. One thread said the 1989 flywheel is approx same weight as the later LWF if you include the ring gear which is built in to the 89 FW and seperate on the RS LWF . Another said the biggest weight diff was in the clutch used. Another suggested that not only is the starter a different length but also the motronic sensor is mounted at a diff spot in the earlier bellhousing. Since you have both early and late flywheels and clutches I would weigh them to confirm and if close then use the 1988/9 flywheel with a new clutch. There are 2 discs available for 89 and I would use the spring centered type not the rubber one. I would guess the spring type is lighter and more reliable also
This way you can sell your extra later LWF and avoid buying an assortment of new parts other than a replacement clutch kit. If looking for a stronger pressure plate the turbo plates have higher clamp loads at the same cost as NA without getting in to Motorsport parts