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I know nothing of the GPR's you listed, but I know you can get a GPR-109 at NAPA for around $30. It fits our trucks...Here's a picture of it.
You ought to test your GPR BEFORE replacing. Just jump the two big posts for about 30 seconds or so (use a screwdriver or jumper cable) and if it then starts easier, the problem is the GPR.
I would go with the stancor relay.As nlemerise mentioned above.It is a much meatier relay.I got mine like 2-3 days after I ordered it.Later on they sent a catalogue with all sorts of switches and other electrical stuff.handy to have in the shop.Anyway go with the stancor.Guzzles mod.You wont be sorry.
Know you already bought one but I got one of these 2 years ago with no issues. At the time was quite a bit cheaper and much heavier than name brands found locally. Posted in case anyone else might be interested. FORD DIESEL GLOW PLUG Relay SOLENOID 6.9-7.3 turbo &non item #280190299768 on e-bay for 39.93 + shipping
I bought the Stancor from Mouser, it was $49.95 plus shipping, was a little hard getting it in place, but as mentioned in previous post it is meatier! my NAPA lasted less than two years, it ain't worth buying the cheaper one again.