I don't understand if you are using the B6 H&R setup why would you not just use the stock parts? adding monoballs to these is pointless and will only make the ride more harsh. I would stay away from them unless you want a very precise handling car added negative camber and using a more advanced shock spring setup.
I run MCS 2WNR shock as shown above with 2.25" dia springs. Full ERP/Tarrett top hats and associated parts. (BTW these parts are all knock offs of the factory motorsports parts with some changes) A shorter stiff 400/500 pound spring with 225 tenders. This is not for most drivers but handles as well as a 964 can.
I am assuming you have these? https://www.rennline.com/rennline-rear-monoball-strut-mount-sealed-sku-sb69-74/
I wouldn't bother and stick with your factory parts. The H&R's will work fine with them.
If you are talking this part?
https://www.rennline.com/rennline-rear-monoball-strut-mount-sealed-sku-sb69-74/
This is a copy of the factory RS rear top hat. This is similar to what is used on the back of the 3.6RS. I just installed these on a US spec cup car. The spring dia should be the same as the stock units and H&R should be as well. The only reason they won't work is the RS springs are cut flat vs round at the ends so the factory parts will be needed for H&R.
RS springs vs stock. H&R should be similar.
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Anthony PCA affiliate '77 member '83 '90 3.8 RS tribute, 91 C4 converted to C2,'93 964 C2, '93 928 GTS M '94 Turbo 3.6, '15 Boxster GTS M,16 GT4,23 Macan GTS,
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