on the kyosho website they say the fs bulkheads are la262 and la263
http://kyosho.com/jpn/support/instru..._ZX_5_FS_t.pdf
but as you can see from the pic of the la263 it only has the 3 stud holes,
http://cgi.ebay.fr/Kyosho-LA263-Fron...ht_1807wt_1139
unless there is some other part number i cant find or kyosho have bought out a new batch of la263 with the 4 holes but havnt put them on their site yet
??