I could be wrong but I think the modern equivalents are those translucent plastic pcb standoffs available from component suppliers. That’s a bit vague I know - maybe KL or someone can suggest a supplier and/or the required type and size. I guess you need to look for a double ended spacer with a shank length the same as the gap between the circuit board and the keyboard chassis. I remember a while ago seeing something that would fit the bill in the RS catalogue here in the UK.