yes WHBM is correct PSA only had the left side smaller forward air stair that went into the lower deck lounge - which was a special order for the 5 a/c PSA ordered - they only took 2 and LTU bought the other 3 airframes.
here you are
http://cdn-www.airliners.net/aviatio.../4/1243480.jpg
LTU did use the stairs for boarding at some outstations
the Court line pair were the only ones to have the big extending rear cargo hold fitted contraptions but these were removed by the end of the first summer's ops due to weight saving and their unreliability
a great idea in theory with the baggage belt loading system made their a/c almost self sufficient at small airports especially if they had had the PSA type front air-stairs fitted too - sadly in 1973 the Arab-Israeli war started another fuel crisis just as Court started ops with L1011's
the court line film on YouTube shows both in operation