Chris, if you need the steel brake line, you're probably going to have to make one yourself. You will need a length of 3/16 steel brake line. Remember to use the metric fittings from the old line. (I know, just re-did my entire rear lines,hoses & proportioning valve ) I believe the part number Richard listed is for the rear brake crossover Hose.
Hope this helps.
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Drake
1989 Reatta White/Blue (145K)
BCA# 43649
RDIV# 973