While Bacobits numbers might be correct, they (as supplied by AT) are not in the normal fashion as far as the US is concerned.
The 17.3mm dimension is from the top of the cartridge to the end of the stylus in its natural, unweighted position. The 28mm dimension is really a vague number describing its over all length from front to back, including the connector pins. 16mm is the width of the cartridge (at the mounting flange).