Front Prop Shaft Spline End Cap Missing

[desullivan]

Just putting back together my Series 2a 109 NADA prop shafts with new U Joints and the Front Prop shaft spline end is missing the protective cap that goes in the middle of the yoke saddle keeping most of the junk out of the spline area. Photos of my rear prop shaft with cap (1st phot) and front shaft without (second photo). Any ideas where to get one of these caps or another solution? Hosts do not have them. Only other option is new prop shaft but would prefer not to do that since the prop shafts are in very good condition besides cost. Any help appreciated!!