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My alternator belt came loose and then got caught in the power steering/fan belt. After limping home I spent time searching the web for locally available replacement belts. There was a lot a misinformation/older threads and not specifically for the 200tdi. Since both belts were destroyed I couldn't take them in for a match. So I spent a lot of time at NAPA to source in-stock belts. (AA and AZ was not helpful) "93 Discovery I 200tdi These are not the spec'd belts but will work to get you on the road.
Alternator: NAPA 3l240W (3/8" x 24" / 9mm x 610mm). Replaced Bearmach ETC7469R
Power steering/Fan: NAPA XL 25 9405 (31/64" x 40-7/8" / 12.5/13mm x 1038mm). Replaced Allmakes 4x4 13A1025