Did Yamaha ever make an Attitude fiver, or is this a custom job? http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7366953450&ssPageName=ADME:B:SS:US:1
I think I've seen an ebay ad for an Attitude P/J fiver recently (within the last six months or so). Dunno if it was a Sheehan model, tho.
That's not a custom job - Yamaha did make stock 5-string Attitudes IIRC. I remember coming across a cheap 5-String Attitude in Asia. It had just one big-ass pickup and a switch that gave you lots of different coil combinations.