It's part No
99451-94 
Parts Catalog '93-'94 Sportster® Models
E-bay
eBay Motors: Harley-Davidson '93-'94 XLH Parts Manual #99451-94 (item 200251688809 end time Dec-02-08 07:18:49 PST)
or any H-D dealer, there is no VAT on books so may be cheaper to import depends on the shipping costs!