as far as im aware, the RA40 GT's were the first to have the sway bar althought the RA40 LT's have the holes in the chassis rail so that you can fit one. on my RA40 i used a RA60 sway bar and mounts.
all RA60's came with sway bars so its likely that you have one of them. they used a 'U' clamp that bolted onto a bracket on the bottom of the diff housing
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