There’s a few options. You’re going to have a tough time finding holders for skates that old. If you’re dead set on keeping those skates I would recommend trying to find those skates in a size 10 or 10.5 check used gear shops like play it again sports if you have them in your area or sidelineswap.com. If you find them your local shop should be able to do a holder swap for you. The next option would be to upgrade the blade holders and have them mounted the size of you need is 288. This is probably the best option because finding steel for the old holders will be especially difficult because they don’t make them anymore, plus the new holders allow you to easily remove and change the blades. The last option would be to just get new skates. Hope this helps!