5120 x 2 . XK120 Late & XK140 & XK150 Sidelight Visual Red Indicator Jewel for weld-on design  sidelight pod (5201). Fit with Lucas motif  towards driver so light refracts correctly ( test with a torch if you are not sure!). Original Number C4691 / LUCAS 573449

FOR FITTING CLIPS SEE : 5121

For mounting pod SEE : 5201

NOTE: Fit will vary depending on thickness of lead loading and also paint layering thickness onto the sidelight necelle / pod area. It is not uncommon for a rebuild to be very heavily painted and the push clip will not fit, so bonding may be required.