HEI Plug Wires

[IllinoisK30]

I have gone through most of the threads on here concerning this topic but have not found what I’m looking for. I’m looking for replacement plug wires for my 1977 Chevy K30 with 350. I went as far as buying an original AC-Delco parts book on eBay. I have the correct Delco numbers, 608U and 608J. I then searched eBay and found them but was disappointed because the distributor end did not have the ring or button on top of the boot for the lock ring to push on to. It’s frustrating because these are Delco genuine parts mainly for GM and all I can find are smooth boot ends at both sides. I am picky and I know this seems petty but I want it done as correct as I can. Does anybody know where I can buy Delco ignition wire sets with the correct end for HEI distributor? Thanks.