2021 Size Guide for Showgard Mounts – U.S. Stamps
| Catalog No. | Commemoratives Description | Single Stamps | Multiples (No. of Stamps) | Plate Blocks and Panes |
| 5543 | 55c Love | #24 | (4)#48 | Pane #143 |
| 5544 | 20c Brush Rabbit | E | (4)#50 | #63 Pane #127 |
| 5545 | 20c Brush Rabbit- Coil | E | (5)#25 | #260/25 |
| 5546 | Barns- Post Card Rate | EH | (4)#44 | Pane #137 |
| 5547 | Barns- Post Card Rate | EH | (5)#25 | #260/25 |
| 5554 | $7.95 Castillo de San Marcos | AH | (4)#63 | Pane #89 |
| 5555 | 55c August Wilson | JV | (4)#50 | Pane #158* |
| 5556 | New Year of the Ox | JV | (4)#80 | Pane #188* |
| 5557 | Chien-Shiung-Wu | JV | (4)#80 | Pane #188 |
| 5558-67 | Garden Beauty | #22 | (10)#61* | Pane #61* |
| 5568 | Colorado Hairstreak Butterfly | S | (4)#63 | Pane #181 |
| 5569-72 | Espresso Drinks | E | (4#)50 | Pane #50 |
| 5573-82 | Star Wars Droids | #36, #48 | (10)#74 | Pane #280/228 |
| 5583-92 | Heritage Breeds | AV | (10)#82 | Pane #215 |
| 5593 | Go For Broke | JV | (4)#80 | Pane #198 |
| 5594-7 | Emilio Sanchez | AH | (4)#31 | Pane #181 |
| 5598-5607 | Sun Science | S | (10)#63 | Pane #163 |
| 5608 | Yogi Berra | JV | (4)#80 | Pane #198 |
| 5609-13 | Tap Dance | JV | (5)#41 | Pane #215 |
| 5614 | Mystery Message | S | (4)#63 | Pane #181 |
| 5615-18 | Western Wear | #31 | (4)#61 | Pane #61 |
| 5619 | Ursula K Le Guin | J | (4)#50 | #63 Pane #151 |
| 5620 | Raven Story | J | (4)#50 | Pane #163 |
| 5621-5 | Mid Atlantic Lighthouses | JV | (5)#41 | Pane #41 |
| 5626 | Missouri Statehood | J | (4)#50 | Pane #151 |
| 5627-34 | Backyard Games | #31 | (8)#63 | Pane #175 |
| 5635 | Happy Birthday | #24 | (4)#48 | Pane #143 |
| 5636-9 | Messsage Monsters | AV | (5)#33* | Pane #198* |
| 5640-3 | Day of the Dead | #24 | (4)#48 | Pane #143 |
| 5644-7 | A Visit From St. Nick | #31 | (4)#61 | Pane #61 |
| 5648-51 | Otters in the Snow | #31 | (4)#61 | Pane #61 |
Sheet Sizes for 2021 Issues
| 55c Love #143 | Star Wars Droids #280/228 | Ursula K Le Guin #151 |
| 20c Brush Rabbit #127 | Heritage Breeds #215 | Raven Story#188 |
| Barns- Post Card Rate #137 | Katharine Hepburn#188 | Mid Atlantic Lighthouses #151 |
| $7.95 Castillo de San Marcos #89 | Go For Broke #198 | Missouri Statehood#151 |
| 55c August Wilson #158* | Emilio Sanchez #181 | Backyard Games#175 |
| New Year of the Ox#188* | Sun Science #163 | Happy Birthday#143 |
| Chien-Shiung-Wu #158 | Yogi Berra#198 | Message Monsters#198 |
| Garden Beauty #66* | Mystery Message #181 | Day of the Dead#143 |
| Colorado Hairstreak Butterfly #181 | Tap Dance#215 | A Visit From St. Nick#61 |
| Espresso Drinks #50 | Western Wear #61 | Otters in the Snow#61 |