What is the minimum/maximum finished size you can produce for booklets stapled on the short edge (landscape)?

We currently have a minimum finished size of 120mm x 120mm for all booklets to be stapled on the short edge (landscape). This does mean we are currently unable to complete an order for Landscape A6 booklets.

The maximum finished size for booklets stapled on the short edge is 148mm x 210mm (A5). This means we are currently unable to complete an order for A4 Landscape booklets.