I have a 1982 Pearson 367 Cutter and am looking for a part for my Wilcox Crittenden Headmate 1460 toilet. I need an "inlet valve cover" that fits onto the manual pump assembly. It is listed as number 8 on the Headmate brochure and is listed as part no. 019596 in the parts list. I would like to buy a used pump assembly or just the valve cover, either way. See the attachment. Any help would be appreciated.