What power steering fluid to use?

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I'm a believer in using the correct spec stuff and don't really subscribe to 'any old stuff will do, it's all the same' approach - each to their own.

I believe this is the correct stuff (?) ACDelco 10-5073 Power Steering Fluid (105073) 808709319313 | eBay

But more than twice the price.

I'll happily use a different brand if I can be certain of spec equivalency.

What might be the appropriate UK equivalent that meets GMs spec?

 

[antijam]

I refilled my system with Ravenol PSF-Y. It meets GM specs GM 9985010, GM 89020661, GM 1050017, at least one of which is specified for C3 Corvettes.

 

[Last triumph]

I refilled my system with Ravenol PSF-Y. It meets GM specs GM 9985010, GM 89020661, GM 1050017, at least one of which is specified for C3 Corvettes.

Thank you.