Order the Douglas awl blade, they are AWSOME. I have 2, regular and slim. Do yourself a favor and skip Tandy tools. I have replaced most Tandy tools with Osborne, Gomph, Douglas, Dixon etc. Sheridan has a tab in top right "Tools" with a drop down "Vintage Tools" where you should be able to pick out a pricking wheel ( #5 on my holsters ) you will be better off skipping the cheap china tools Tandy sells.
Good luck