UPDATE: replacement latches for the Mark V can be found here: http://www.dblittle.com/catalog/product_info.php?cPath=29&products_id=108
I found a dealer of Penn Fabrication parts, who is willing to order the replacement latches for my Rhodes Mark V piano. This is great, because Penn Fabrication had a minimum order restriction of $75. Parts Express has been very responsive to my requests for these parts. Also, if you have a Rhodes Mark V that needs replacement latches for the case lid, this is the only source that I have found that can get adequate replacements.
Once I recieve the latches and get them installed, I’ll take some pictures and post them.