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Ford Sierra and Sapphire - Sierra rear wishbone - R30

I am using Sierra (2WD drums) suspension on a kit car that I am building. As I was stripping the rear wishbones last week I found that the drivers side was badly corroded and must be discarded. I am having difficulty finding replacements.

However, I have found a source that offers new Granada mk3 wishbones and Cosworth wishbones. Does anyone know is these are interchangable? The tabs and clips on the top don't matter as I can weld on replacements.

Alternatively, does anyone have a source for Sierra wishbones - they are few and far between in our local scrap yards and the ones that I have found are as badly corroded as the ones that I am taking off?