The servo should have a code or letter on it to verify that its a R servo. IF it is an R servo then you should not need to buy a new one, they are just newer better looking copies of the originals with the same clamping force etc.
Broader is very good for the parts, hes very knowledgable as I have also gotten a good bit of parts from him to beef up my C6 that was in a lincoln. Mine is very stout though with a billet R servo, E lever, transgo shift kit and full Red alto clutches (max clutch pack sizes IE 5 clutch drums, all the internal upgrades and rollerized #9 bearing). Also sports pump mods for max cooling and a cast aluminum deep pan and has been converted to the more desireable short tail style. Mines behind me 550fwhp 521 BBF and has a 100-250 shot of NOS. Also has a 3000 stall 10" beefed up converter with Nitrous anti-ballooning plates and all the other goodies.
Only reason im saying all this is that Im prob going to be putting mine up for sale soon as I really want to go with a OD trans for more highway driving as I dont race really anymore. If you dont need the trans at this moment I should be pulling it by the end of sept in which case I would sell the whole thing whole with converter if your interested. This trans is setup for 800hp easily.
If not broader is good to work with!
521 BBF 10.8:1 FAST EZ EFI 2.0
2004R GM OD Trans swap, NX NOS kit