I’ve complained enough here about the ridiculous USA price for the AF3/AF5 arm bases. This solution from Italy is 1/10th the price! The quality is extremely nice. As you can see, this one base accommodates any distance due to the sliding design. It comes with 3 different sets of stainless steel posts.
http://www.audiogears.it/category.php~idx~~~222~~MICRO+SEIKI+TONEARM+BASES~.html
http://www.audiogears.it/category.php~idx~~~222~~MICRO+SEIKI+TONEARM+BASES~.html