I worked in the parts department of a local Ford dealer back in 1978-1980 when it also had a RR franchise. The RR was dropped after that time because they could only supply us with six cars a year, which was far fewer than we could sell.
The Rolls was a beautifully appointed car compared to everything else. Real polished wood, fine leather seats, flawless body and paint. But if you looked under the trunk carpet and poked under panels and such, the car was no better made than a Lincoln.
The only regular work we ever did on the cars was brakes. The Rolls had a very strange brake system that had several additional complex pieces that I have never seen on another car. Instead of fluid going from the master cylinder to the wheel cylinder, as in most cars, it had to run through a series of servos or valves, which tended to break down. It cost a small fortune to do a brake job because of the extra parts and their pricing.
We had one car come in for a lot of mechanical work. It needed a transmission rebuild, but getting the parts was no problem for me because it had a Chevy TH400 automatic transmission in it. I got the parts from a nearby Buick dealer. It also needed an air conditioning compressor and a few other pieces. No problem, they were also Chevy parts. All the parts guys were quite amused that an expensive car like a Rolls had so many Chevy parts on it.
Of course, the owner probably paid a fortune for those parts, being as how it was a Rolls. There was one air conditioning valve that the mechanic insisted I order from Rolls that was only about an inch long. When it came in, I opened the Rolls box to look at the part and found a typical red and white GM Delco box inside with the part. What cost about $45 from Rolls was an extremely common GM part available in any auto parts store for about $5.
Interesting thing about Rolls parts back then - at that time we ordered parts from New York, and anything that they did not have in stock had to come from Rolls in England. We were informed at one time that no parts would be available from England for a month or so. Turns out the Rolls plant used old wood shelving to store their parts on and had been using this setup for decades. A lot of parts were not marked but located on shelves. Seems everyone knew where the parts were in the shelving and didn’t need a number to locate them.
One day someone with a forklift hit one of the shelves and it fell into another, causing a domino effect that knocked down a lot of shelving and scattered parts all over the floor. Now, no one could identify many of the parts and the place shut down for a month to straighten it all out. I heard that a lot of older and rare parts were lost that day because they could not be identified, so they were simply thrown out.