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Hey -Oval,
I'm doing a 5-link IRS, somewhat similar to what you're planning. I happened to luck into a NOS set of Chassis Shop uprights after looking around quite a bit to see what was available. Unfortunately, C/S no longer makese these uprights - which are pretty neat because they'r fairly lightweight and take all standard air cooled bearings and stub axles.
The other alternative as I see it is either go with alloy formula car style uprights (these generally take water cooled VW bearings & axles), or the more reasonable approach cost wise is to adapt a set of standard FWD spindle assemblies - the ones that use bolt-on struts. Modify the upper mount to take an a-arm or link, fab up a custom lower arm to fit the ball joint and use the steering arm for a toe link.
Either way, it's a lot of custom work - but seeing your frame and oval project it doesn't seem out of line for what you're building.
Jeff
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