The exact ones that I bought from Amazon are no longer available but it looks like these may also work (according to the Q&A section on the page) [Monster Fastener FBA_SHSPT-005-25 Divided Pin Shelf Rest (25 pieces) https://www.amazon.com/dp/B003QSEERI/ref=cm_sw_r_cp_api_glt_fabc_V48AFRQVET1AYRJZX4FP](Monster Fastener FBA_SHSPT-005-25 Divided Pin Shelf Rest (25 pieces) https://www.amazon.com/dp/B003QSEERI/ref=cm_sw_r_cp_api_glt_fabc_V48AFRQVET1AYRJZX4FP)

I did a search for the IKEA part number for the pins, # 101532.