i had some rose jointed tca's from burtons and backed them
they was horrid
got a pair from martin at mef in the end (he no longer does any rst stuff tho)
still thinking about the bladed arb myself
are you still using the tcas?
RD do a bladed arb for the sierra, but, iirc they were reputed not to be very good. but for a road car i think they may be fine, though i think there would have to be some modification involved?
i did have baldes frt and bck on my old sierra, but it wasn't rd.
they were awesome... on soft, when you jacked the car up, they wheels would droop about 6"
on stiff it was an 1", incredible bit of kit