I bought upper and lower Radiator hoses, Over Flow Tank Hose, Motor & Transmission mounts and a bunch a transmission Filters from Rock. All the ones I have used fit OK.
That was over 1 year ago.
Unfortunately management at those places change and you never know how helpful a person on the phone will be. So far I have not had to speak with any of the places where I ordered parts.
I have not oreded with them as there shipping is a price killer. If you want to order a lot of 1 item like I did with the Transmission filters that will be shipped from the same place you might get a break on the shipping when the item cost and the shipping are added and devided as cost per item.

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84 300D, 82 Volvo 244Gl Diesel