Presumably this is the 1/48th scale kit, dating from the early 1890s? if so, finding anything specifically designed for this kit will be difficult, if not impossible, as aftermarket stuff just didn't exist at that time (apart from the odd white metal or pe part).
Cockpit sets designed for other kits might work, but as I remember it, this kit was rather narrow in the fuselage cross section, so any aftermarket parts would need adapting more than usual.
Depends what you want to add, but not that much can be seen of the cockpit of the 'D' in this scale (not much in 1/32nd scale either!), so perhaps some scratch-built additions might be a better, and much cheaper, option?